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Information for MLCS

Kathleen Almy, Heather Foes
Rock Valley College

Emails: kathleenalmy@gmail.com

        heather.foes@gmail.com

Blog:   http://almydoesmath.blogspot.com

        Blog contains video, pilot updates, presentations, and more.

Mathematical Literacy for College Students (MLCS)

3 – 6 semester hours
Prerequisite: Appropriate placement or prealgebra with a grade of “C” or better

The goal of developmental mathematics education is to provide students with the necessary skills and
understanding required to be successful in college level mathematics. It is not necessarily intended to be a
repeat of high school mathematics. While many programs and initiatives have been developed to improve the
state of developmental education, part of the problem lies in the content and courses taught. Mathematical
Literacy for College Students (MLCS) is a new course being developed at the national level by AMATYC’s New
Life for Developmental Mathematics. Its origins are related to Quantway, funded by the Carnegie Foundation.
MLCS is an alternative path to certain college level math courses or further algebra. It integrates numeracy,
proportional reasoning, algebraic reasoning, and functions with statistics and geometry as recurring course
themes. Throughout the course, college success components are integrated with the mathematical topics.
The course focuses on developing mathematical maturity through problem solving, critical thinking, writing,
and communication of mathematics. Content is developed in an integrated fashion, increasing in depth as the
course progresses. Upon completion of the course, students will be prepared for a statistics course or a
general education mathematics course. Students may also take intermediate algebra upon completion if they
choose to pursue STEM courses.


MLCS provides an alternative to beginning algebra, creating multiple pathways for the developmental
students. However, it is more rigorous than beginning algebra to ensure students are prepared for a college
level math course upon successful completion. It allows students to potentially complete their developmental
math and college level math requirement for an Associate in Arts degree in one year total (one semester
each), working toward the goal of improving college completion rates. It promotes 21st century skills to
prepare students for both the workplace and future coursework. Further, it does not diminish requirements
for non-STEM college level math courses but instead creates appropriate paths to these courses with the same
level of intensity and complexity as the current path through intermediate algebra. The course has college
level expectations and coursework but with a pace and instructional design intended for the adult,
developmental learner. This strategy emulates the approach taken by the Common Core Standards and aligns
with them as well.
1|Page
MLCS Course Description and Objectives
Mathematical Literacy for College Students is a one semester course for non-math and non-science majors integrating
numeracy, proportional reasoning, algebraic reasoning, and functions. Students will develop conceptual and procedural
tools that support the use of key mathematical concepts in a variety of contexts. Throughout the course, college success
content will be integrated with mathematical topics.

Prerequisite: Appropriate placement or prealgebra with a grade of “C” or better

COURSE OUTCOMES
1.      Apply the concepts of numeracy in multiple contexts.
2.      Recognize proportional relationships and use proportional reasoning to solve problems.
3.      Use the language of algebra to write relationships involving variables, interpret those relationships, and solve
        problems.
4.      Interpret and move flexibly between multiple formats including graphs, tables, equations, and words.
5.      Demonstrate student success skills including perseverance, time management, and appropriate use of
        resources.
6.      Develop the ability to think critically and solve problems in a variety of contexts using the tools of mathematics
        including technology.


COURSE OBJECTIVES
Upon successful completion of this course, the student will be able to:

Numeracy

1.   Demonstrate operation sense and the effects of common operations on numbers in words and symbols.
2.   Demonstrate competency in the use of magnitude in the contexts of place values, fractions, and numbers written in
     scientific notation.
3.   Use estimation skills.
4.   Apply quantitative reasoning to solve problems involving quantities or rates.
5.   Demonstrate measurement sense.
6.   Demonstrate an understanding of the mathematical properties and uses of different types of mathematical
     summaries of data.
7.   Read, interpret, and make decisions based upon data from line graphs, bar graphs, and charts.

Proportional reasoning

8. Recognize proportional relationships from verbal and numeric representations.
9. Compare proportional relationships represented in different ways.
10. Apply quantitative reasoning strategies to solve real-world problems with proportional relationships.

Algebraic reasoning

11. Understand various uses of variables to represent quantities or attributes.
12. Describe the effect that changes in variable values have in an algebraic relationship.
13. Construct and solve equations or inequalities to represent relationships involving one or more unknown or variable
    quantities to solve problems.


2|Page
Functions

14.   Translate problems from a variety of contexts into a mathematical representation and vice versa.
15.   Describe the behavior of common types of functions using words, algebraic symbols, graphs, and tables.
16.   Identify the reasonableness of a linear model for given data and consider alternative models.
17.   Identify important characteristics of functions in various representations.
18.   Use appropriate terms and units to describe rate of change.
19.   Understand that abstract mathematical models used to characterize real-world scenarios or physical relationships
      are not always exact and may be subject to error from many sources.

Student success

20.   Develop written and verbal skills in relation to course content.
21.   Evaluate personal learning style, strengths, weaknesses, and success strategies that address each.
22.   Research using print and online resources.
23.   Apply time management and goal setting techniques.


Mathematical success

24. Develop the ability to use mathematical skills in diverse scenarios and contexts.
25. Use technology appropriately including calculators and computers.
26. Demonstrate critical thinking by analyzing ideas, patterns, and principles.
27. Demonstrate flexibility with mathematics through various contexts, modes of technology, and presentations of
    information (tables, graphs, words, equations).
28. Demonstrate and explain skills needed in studying for and taking tests.




3|Page
Implementation Options
MLCS is a 3 – 6 credit hour course depending on the depth and breadth desired.

1.     Replacement Model:      Use MLCS to replace beginning algebra.




2.     Augmented Model:        Use MLCS to create a non-STEM alternative to beginning algebra that provides sufficient
                               preparation for statistics or liberal arts math.




3.     Supplemental Model:     Use MLCS lessons for problem solving sessions in an Emporium model (lab-based
                               traditional redesign.), engaging all students and moving beyond skills alone.




4.     High School Model:      Use MLCS lessons for 4th year high school course to develop college readiness and help
                               students place into college level math.




4|Page
FP
                               80–90 min     3.12              Get in Line
                           Explore           On a comprehensive final exam, a professor asked each student to list the number of hours
                                             spent studying for the test. She chose a few of the students’ results and compiled them into
               10 min                        a table. This helps her see trends that may prove useful for her future classes.
    Instructor note:  Instruct stu-
    dents to work on #1–6 in groups.                          Number of Hours Studied             Test Score Out of 100
    Go over answers.
                                                                            0                                 62

                                                                            1                                 66

                                                                            2                                 70

                                                                            3                                 74

                                                                            4                                 78

                                                                            6                                86

                                                                            9                                 98



                                             	1.	Each time the number of hours increases by 1, the test score increases by            4        .
                                                 Each time the number of hours increases by 2, the test score increases by            8        .
                                                 Each time the number of hours increases by 6, the test score increases by           24        .
                                                 Use each of these answers to write a ratio in the form
                                                     increase in test score    4
                                                                             =
                                                 increase in number of hours   1


                                                      
                                             	2.	Since the ratios of increase in number of hours studied to increase in test score are
                                                 ­always        4        , we can say there is a       linear          relationship
                                                 b
                                                 ­ etween the number of hours studied and the test score. 
                                             	3.	Write the slope with units and interpret it.
                                                 Slope is 4 point/hour studied. For every hour studied, a student will gain 4 points on the
                                                 final exam.

                                                     

                                                    
    Instructor note:  We are using           	4.	Write a formula for the test score, T, based on the number of hours, h, a student studies.
    patterns and inductive reason-
    ing here. Formal equation writing                                                T = 4h + 62
    comes in Cycle 4. If students need
    a hint, remind them that the scores
    start at 62 and increase by 4. This
    idea is very useful for writing linear   	5.	Where is the slope in the table? In the equation?
    equations.
                                                 The slope is the rate of change in the table. It is the coefficient of the independent variable
                                                 in the equation.




                                             	6.	Where is the number 62 in the table? In the equation?
                                                 It was the score associated with 0 hours studied. It is the constant in the equation.

                                                     

                                                     
c
LESSON 3.12 Get in Line       343


                     Discover          Let’s look at this situation and the data using a graph.
          20 min
                                       	7.	Create a graph using the coordinate system provided.

Instructor note:  Bring the
                                                                                        Final Exam
class together to complete #7–10.                                 100

Instructor note:  Discuss the                                          96
setup of the graph and the choices
                                                                       92
for scales on the axes to expose
students to the idea of domain (rea-                                   88
sonable values for the independent
variable) and range (reasonable val-                                   84




                                                          Test score
ues for the dependent variable).
                                                                       80
It’s reasonable to have fractions
and decimals for the hours studied                                     76
but not negative values. The hours
can continue to increase somewhat,                                     72
but there is a physical limit. Also,
                                                                       68
there is a limit to what the test
score can be.                                                          64
Draw a right triangle from (1, 66)
                                                                       60
to (2, 70) on the line. Ask students
for the rise and run of the triangle
to find the slope of the line. m = 4                                        1   2   3   4   5    6    7   8    9    10
                                                                                        Hours studied
(4 additional points for each hour
studied).


Explain that while we graphed the      	8.	Where do the slope and the number 62 appear on the graph?
line by plotting points, we could
use the slope to find more points          The slope is the rise compared to the run when moving between points on the line. The
on the line once a point on it is          point (0, 62) is where the line crosses the y-axis.
plotted.

                                       Let’s look more closely at how the equation of a line and its graph are related.



                                          A Closer Look
                                          Learn
                                       Intercept                                                                      y



                         look
                                       The point at which a graph crosses an axis is                                 6
                                       called an intercept. If the graph crosses the x-axis,                         5
                                       the point of intersection is called an x-intercept.                           4

                         it up         If the graph crosses the y-axis, the point of inter-
                                       section is called a y-intercept.
                                                                                                                     3
                                                                                                                     2
                                                                                                                     1
                                       For example, this graph has an x-intercept of                –6 –5 –4 –3 –2 –1 0   1 2 3 4 5 6
                                                                                                                                        x
                                       ( - 2, 0) and a y-intercept of (0, 4).                                        –1
                                                                                                                     –2
                                                                                                                     –3
                                                                                                                     –4
                                                                                                                     –5
                                                                                                                     –6




                                          The formula T = 4h + 62 is in a very useful form because it clearly shows the
                                          slope and y-intercept of the graph. The equation is in slope-intercept form.
344     Cycle 3




Instructor
note:  Although it                      Slope-intercept form
is conventional to

                         look
                                        Linear graphs have equations that can be written in the form y = mx + b, called slope-
use y = mx + b, it
                                        intercept form. x represents the independent variable, and y is the dependent variable.
is often easier for
                                        When an equation is in slope-intercept form, the coefficient of x is the slope. The con-
students to think
of linear equations
as y = b + mx.
                         it up          stant b represents the y-coordinate of the point where the line intersects the y-axis. The
                                        ordered pair (0, b) is the y-intercept.
This order is used
when graphing                                  dependent variable                                      independent variable
with the slope and                           graphed on vertical axis                               graphed on horizontal axis
y-intercept and it’s                                                         y = 50x + 200
how most contex-
tual problems are
described with an
                                                                          slope             y-coordinate of y-intercept
equation: a starting                                                    (change)                  (starting value)
point and change
from it.                                For example, imagine you have $200 in a savings account and you deposit $50 each month.
                                        This equation has m = 50 and b = 200. So the line has a slope of 50 and y-intercept of
                                        (0, 200). We can read these values only from an equation in slope-intercept form.



                                           Practice
                                           We have now learned that linearity can be seen from a table when there is a constant
                                           rate of change, on a graph when the points fall in a line, and in an equation of the
                                           form y = mx + b.

Instructor note:  Remind                   Example 1  For each linear equation, list the slope and y-intercept. Remember,
students that every number has a           the y-intercept is an ordered pair, not a number.
sign. Don’t separate the sign from
a number.
                                           	a.	 y = -3x - 2  m = -3, y-intercept is (0, -2)

                                                      x         1
                                           	b.	 y =     - 8  m = , y-intercept is (0, -8)
                                                      2         2

                                           	c.	 y = 4 - x  m = -1, y-intercept is (0, 4)

                                           practice 1  For each linear equation, list the slope and y-intercept. Remember,
                                           the y-intercept is an ordered pair, not a number.
                              5 min
                                           	a.	 y = -x + 1  m = -1, y-intercept is (0, 1)
Instructor note:  Instruct
students to work in groups. Check          	b.	 y = -x  m = -1, y-intercept is (0, 0).
answers and clear up issues. Signs
and implied coefficients usually           	c.	 y = 4  m = 0, y-intercept is (0, 4).
present a challenge.
                                           	d.	T = 4h + 62  m = 4, y-intercept is (0, 62).
                                           Let’s graph a linear equation in two ways. The first method requires finding points
                                           that appear on the line. Organizing the points into a table is helpful. The second
                                           method uses the slope and y-intercept.
                                           Example 2  Complete this table for the following linear equation: y = -5x - 6.
                            10–15 min                                         x                y
 Instructor note:  After going                                               -1                -1
 over answers to the practice
 problems, work with the class on                                              0               -6
­example 2.
                                                                               1            -11

                                                                               2            -16
LESSON 3.12 Get in Line        345



                                         We can choose any values for x. The numbers in the table are whole numbers and
                                         are small, which make calculations faster. Notice that we are picking x, plugging it
                                         into the equation, and finding y. The value of y depends on whatever we choose for
Instructor note:  Remind stu-
                                         x. We can connect the points with a line because the rate of change is constant, mak-
dents that although only 2 points
are needed to draw a line, a third       ing the pattern linear.
point provides a check.
                                         Plot the points and graph the line.
                                                                                      y

                                                                                     20
                                                                                     18
                                                                                     16
                                                                                     14
                                                                                     12
                                                                                     10
                                                                                      8
                                                                                      6
                                                                                      4
                                                                                      2
                                                                                                                      x
                                                        –20   –16   –12   –8   –4     0   2 4 6 8 10 12 14 16 18 20
                                                                                     –2
                                                                                     –4
                                                                                     –6
                                                                                     –8
                                                                                    –10
                                                                                    –12
                                                                                    –14
                                                                                    –16
                                                                                    –18
Instructor note:  The slope is                                                      –20
- 5, which is easier to work with as
             -5
the fraction    . We can move down       If you recognize the slope and y-intercept of a line, you can often graph it very
              1
5 and to the right 1 from the            quickly. To graph a line, we need to know a point to get a rough location on the grid
y-intercept. Or we can think of the      and also how the line is tilted. The y-intercept gives us a location, and the slope tells
           5                             the steepness.
slope as     and move up 5 and left
          -1
1. Do this again to get a third point.       Find the slope from the equation y = -5x - 6 and verify it by finding the rate
Students should notice that this             of change in the table.  m = -5
graph is the same as the first graph.
                                             Find the y-intercept from the equation and verify it in the table.  (0, -6)
Instruct students to work on prac-
tice 2. Check answers. Ask which             Plot the y-intercept. Use the rise and run of the slope to move to another point
method they prefer.                          on the line.
                                                                                      y

                                                                                    20
                                                                                    18
                                                                                    16
                                                                                    14
                                                                                    12
                                                                                    10
                                                                                     8
                                                                                     6
                                                                                     4
                                                                                     2
                                                                                                                      x
                                                        –20   –16   –12   –8   –4     0   2 4 6 8 10 12 14 16 18 20
                                                                                     –2
                                                                                     –4
                                                                                     –6
                                                                                     –8
                                                                                    –10
                                                                                    –12
                                                                                    –14
                                                                                    –16
                                                                                    –18
                                                                                    –20
346      Cycle 3



                                                                            3
                                         practice 2  Suppose y = - x + 5.
                                                                            4
                              5–10 min   	a.	Graph this linear equation by making a table of points. To avoid fractional
                                             y-values, choose x-values that are multiples of the denominator of the slope.
                                                                                                       y

                                                                                                     10
                                                 x           y                                        9
                                                                                                      8
                                                -4           8                                        7
                                                                                                      6
                                                  0          5                                        5
                                                                                                      4
                                                  4          2                                        3
                                                                                                      2
                                                                                                      1
                                                                                                                                  x
                                                                        –10 –9 –8 –7 –6 –5 –4 –3 –2 –1 0   1 2 3 4 5 6 7 8 9 10
                                                                                                      –1
                                                                                                      –2
                                                                                                      –3
                                                                                                      –4
                                                                                                      –5
                                                                                                      –6
                                                                                                      –7
                                                                                                      –8
                                                                                                      –9
                                                                                                     –10




                                             	b.	 Graph this linear equation by using the slope and y-intercept.
                                                      -3
                                                m =      , y-intercept is (0, 5)
                                                      4

                                                                                       y

                                                                                     10
                                                                                      9
                                                                                      8
                                                                                      7
                                                                                      6
                                                                                      5
                                                                                      4
                                                                                      3
                                                                                      2
                                                                                      1
                                                                                                                     x
                                                        –10 –9 –8 –7 –6 –5 –4 –3 –2 –1 0   1 2 3 4 5 6 7 8 9 10
                                                                                      –1
                                                                                      –2
                                                                                      –3
                                                                                      –4
                                                                                      –5
Instructor note:  Remind                                                              –6
students that we have used the                                                        –7
method of plotting points (as in                                                      –8
part a) throughout the book so far.                                                   –9
The method used in part b is a                                                       –10
shortcut but it only works for lines.
LESSON 3.12 Get in Line        347




                                       When working with real data, we need to be able to interpret the slope and
                                       y-intercept, not just find them. Keep in mind that slope compares the rise and
                                       run or the dependent and independent variables. We can use this idea to write a
                                       r
                                       ­ atio to interpret the slope.

                                       Example 3  If gas costs $3.65 per gallon with a $5.50 car wash, a formula for
                                       the cost (C) of g gallons of gas and the car wash is given by C = 3.65g + 5.50.
                              5 min     This equation, or model of the situation, is also a function since there is only one
                                        cost ­ ssociated with each value of g. The equation is linear. If it helps, think of the
                                             a
                                       ­equation as y = 3.65x + 5.50. List the slope and y-intercept.
                                       m = 3.65, y-intercept is (0, 5.50)
                                        
                                        
                                       The values of the slope and y-intercept matter, but their meaning is also important.
                                                                   change in y        change in cost         3.65
                                                         Slope =                 =                       =
                                                                   change in x       change in gallons         1
                                       Interpret the slope in words:  For each gallon of gas, we will pay an additional $3.65.

                                       Interpret the y-intercept in words:  The car wash, without any gas, would cost $5.50.

Instructor note:  Explain the

                                                                                                       Sticky
Sticky Note. Instruct students to




                                                                                                                       note
work in groups for practice 3. Go
over answers.                                       Keep in mind that slope-intercept
                                                                                        form does not have to use
                                                    the letters y and x. If you see an equ
                                                                                           ation in this form, it is
                                                    in slope-intercept form:

                                                       Dependent = Number  ~  Independ
                                                                                       ent + Number
                                                       Variable        Variable
                                                           
                                                       y               =     mx       +   b
                                                   The numbers, which represent the
                                                                                        slope and y-intercept, can
                                                   be positive, negative, or zero, and
                                                                                       are not necessarily identical.




                                       Practice 3  For each problem, write an equation to model the situation. Interpret
                                       the slope and y-intercept in words. Also list which variable would be on the hori-
                            5–10 min   zontal axis and which would be on the vertical axis.
                                       	a.	Model the cost if you buy an iPod for $200 and download songs for $1.29 each.
                                           C = 1.29s + 200 would give the cost, C, of the iPod and s songs.
                                           The slope gives the price per song of $1.29. The y-intercept would be (0, 200), indi-
                                           cating the cost of the iPod with 0 songs downloaded. The number of songs, s, would
                                           be on the horizontal axis. The cost, C, would be on the vertical axis.
                                        
                                        


                                        
                                        
                                        
348     Cycle 3




                                        	b.	Model the weekly salary a salesman earns if the salary is a combination of his
                                            base salary and commissions on his sales. His base weekly salary is $500 and he
                                            makes $50 for each sale.
                                              S = 500 + 50n, where n is the number of sales he makes and S is his weekly salary.
                                              The slope gives the commission per sale of $50. The y-intercept would be (0, 500),
                                              indicating his salary if he made 0 sales. The number of sales, n, would be on the hori-
                                              zontal axis. S would be on the vertical axis.
                                         
                                         
                                         


                                         
                                         



                     Connect         In this cycle, we have defined linear equations as equations of the form ax + b = c, where
                                     a is not zero. But in this lesson, we have also referred to equations in y = mx + b form as
          10 min                     linear. Let’s connect these ideas.
Instructor note:  Complete #9        	9.	 Suppose y = 2x + 4.
                                                                                                                      y
as a class. This ensures students
will make the necessary connec-             	a.	 Graph the equation using the slope                                  6
tions between solving and graphing               and y-intercept.                                                    5
linear equations.                                                                                                    4
                                                                                                                     3
                                                                                                                     2
                                                                                                                     1
                                                                                                                                        x
                                                                                                    –6 –5 –4 –3 –2 –1 0   1 2 3 4 5 6
                                                                                                                     –1
                                                                                                                     –2
                                                                                                                     –3
                                                                                                                     –4
                                                                                                                     –5
                                                                                                                     –6


                                            	b.	 Pick an ordered pair from the graph that appears to be on the line and confirm
                                                 that the ordered pair is on the graph in part a.
                                               Answers will vary.

                                                   
                                            	c.	 Pick another ordered pair from the graph that appears to be on the line and con-
                                                 firm that the ordered pair is on the graph in part a.
                                               Answers will vary.


                                            	d.	 How are the points on the line related to the equation y = 2x + 4?
                                               The coordinates of the points on the line are the solutions of the equation.

                                                   
                                            	e.	 How do you know for sure that the point (-100, -196) is on the graph of the line
                                                 y = 2x + 4 even though you cannot see it in the graph in part a?
                                               Since the ordered pair is a solution to the equation, the point must lie on the line.

                                                 
LESSON 3.12 Get in Line   349


                       Reflect
                                           wrap-up



                                     lesson
             5 min
Instructor note:  Explain the
                                              What’s the point?
contents of the Wrap-Up. Have stu-            Linear situations can be seen in tables, graphs, and equations.
dents write an answer to the cycle
question, “Why does it matter?”               What did you learn?
A prompt is provided to help stu-
dents. Discuss homework.                      How to find and interpret the slope and y-intercept from a linear equation
                                              How to graph lines using tables and slope and y-intercept

                                              Cycle 3 Question: When is it worth it?
                                              When is it worth drawing a graph to see and understand the slope? When are
                                              you able to get the information you need from the equation alone?
                                              Answers will vary.




                                       3.12  Homework
                                       Skills      MyMathLab
                                       •	 Find and interpret the slope and y-intercept from a linear equation.
                                       •	 Graph lines using tables and slope and y-intercept.

                                       	1.	List the slope and y-intercept:  y = 3 - 2x.
                                           m = -2, y-intercept is (0, 3)

                                                

                                              
                                       	2.	Use the slope and y-intercept from #1 to form the graph.
                                                                                      y

                                                                                     6
                                                                                     5
                                                                                     4
                                                                                     3
                                                                                     2
                                                                                     1
                                                                                                        x
                                                                    –6 –5 –4 –3 –2 –1 0   1 2 3 4 5 6
                                                                                     –1
                                                                                     –2
                                                                                     –3
                                                                                     –4
                                                                                     –5
                                                                                     –6



                                                

                                                
350   Cycle 3


                Concepts and Applications
                •	 Find and interpret the slope and y-intercept from a linear equation.

                	3.	For each situation, write a linear model. Find and interpret the slope and y-intercept.
                    	a.	 A student has $2,000 in debt from college loans, along with $500 payment for
                         every month she has left to pay off her car. Model her total debt.
                       D = 2,000 + 500m, where m = number of months and D = total debt
                       The slope is 500, meaning she has an additional $500 of debt for each month that
                       passes in which she has not paid off her car.
                       The y-intercept is (0, 2000). This means that without the car debt, she would have
                       $2,000 of debt.

                        

                          
                    	b.	 A man has a starting weight of 205 pounds and is losing 10 pounds each month.
                         Model his weight.
                       W = 205 - 10m, where m = number of months and W = the man’s weight
                       The slope is -10, meaning he is losing 10 pounds per month.
                       The y-intercept is (0, 205). This means before he starts losing weight, when no months
                       have passed, his weight is 205 pounds.

                        

                        
                	4.	Imagine a company is offering newly hired employees three salary-pricing structures.
                    One option computes raises by adding $1,000 and then a 3% increase. Another option
                    computes raises by adding a 3% increase and then $1,000. A final option option com-
                    putes raises by adding a 5% increase.
                    	a.	 Write a formula for computing the new salary under each plan, where
                         NS = New Salary and S = Old Salary.

                       Add $1,000; increase by 3%  NS1 = 1.03(S + 1,000)

                       Increase by 3%; add $1,000   NS2 = 1.03S + 1,000

                       Increase by 5%	                   NS3 = 1.05S


                    	b.	 In each formula, what is the independent variable?     S, the original salary in dollars
                         What are the dependent variables?	                     NS1, NS2, NS3


                    	c.	 Using the formulas you created, complete the table below. All amounts are in dollars.

                 Old Salary, S    NS1 = 1.03(S + 1,000) NS2 = 1.03S + 1,000                   NS3 = 1.05S
                    10,000                  11,330                       11,300                   10,500

                    20,000                  21,630                       21,600                   21,000

                    30,000                  31,930                       31,900                   31,500

                    40,000                  42,230                       42,200                   42,000

                    50,000                  52,530                       52,500                   52,500
LESSON 3.12 Get in Line        351


	d.	 Simplify the first equation and list the three equations below. What do you notice
     about their slopes and y-intercepts?
   NS1 = 1.03S + 1,030

   NS2 = 1.03S + 1,000

   NS3 = 1.05S

   The slopes are the same for Options 1 and 2. The first equation’s value of b is exactly
   $30 more than the value of the second equation. The third equation has a different
   slope and y-intercept than either of the first two.

    

         
	e.	 Of Options 1 and 2, which will always be better and why?
   Simplified, we can see that the rate of change is the same, but Option 1 will always be
   $30 more than Option 2.

    
    
      
	f.	 Since the three lines are very close to each other, a specific graph is not helpful in
     this case. Instead, use only the y-intercepts and slopes to make a rough sketch of all
     three lines on the same graph. Use the fact that lines with the same slope are parallel.

                              New Salary vs. Old Salary
       New salary




                                                                    Option 1
                                                                    Option 2
                                                                    Option 3


                                       Old salary

	g.	 Solve an equation to determine for which original salary amount the first two
     o
     ­ ptions produce equal new salaries.
   1.03(S + 1,000) = 1.03S + 1,000; no solution  
   There are no salaries for which the first two plans produce equal new salaries.

    

      
	h.	 Solve an equation to determine for which original salary amount the second and
     third options produce equal new salaries.
   1.03S + 1,000 = 1.05S; S = $50,000  
   For an original salary of $50,000, the second and third plans both produce the same
   new salary.

    

    
352   Cycle 3


                	5.	In the Explore, you looked at how the number of study hours is related to a student’s
                    exam score.
                    Imagine the professor’s data had instead been the following:

                                      Number of Hours Studied             Test Score Out of 100
                                                   0                                 62

                                                   1                                 66

                                                   2                                 48

                                                   2                                 70

                                                   3                                 74

                                                   4                                 78

                                                   6                                 86

                                                   6                                 78

                                                   9                                 98

                                                   9                                 74

                    	a.	 Does this data represent a function? Did the original data in the Explore represent
                         a function? Explain.
                       The original data represented a function, but this data does not since there are values of
                       the independent variable that are matched with more than one value of the dependent
                       variable.
                        

                            
                    	b.	 What could the instructor do to get an equation to model the data? 
                       Draw a scatterplot and find a trendline.




                	6.	a.	 Do all lines have a y-intercept? Why or why not?
                       No, vertical lines do not have a y-intercept (unless the vertical line is the y-axis).

                        
                          
                    	b.	 What kinds of lines are not functions?
                       Vertical

                        
                       
                	7.	Decide whether or not each equation is linear. If necessary, complete a table to help
                    you decide. If the equation is linear, identify the slope and the y-intercept.
                    	a.	 y = x - 4	          linear	           slope = 1, y@intercept = (0, -4)


                    	b.	 y = 4 - x	          linear	           slope = -1, y@intercept = (0, 4)


                               1
                    	c.	 y =     - 4 	       not linear
                               x
LESSON 3.13 Gas Up and Go   353


              1
	d.	 y =            	 not linear
           (x - 4)

           1                                 1
	e.	 y =     x 	       linear	     slope =     , y@intercept = (0, 0)
           4                                 4



                                               , y@intercept = a0, bU	    
           (x + 1)                           1                    1
	f.	 y =            	 linear	      slope =
              4                              4                    4

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Mlcs handout with math lit lesson 3.12

  • 1. Information for MLCS Kathleen Almy, Heather Foes Rock Valley College Emails: kathleenalmy@gmail.com heather.foes@gmail.com Blog: http://almydoesmath.blogspot.com Blog contains video, pilot updates, presentations, and more. Mathematical Literacy for College Students (MLCS) 3 – 6 semester hours Prerequisite: Appropriate placement or prealgebra with a grade of “C” or better The goal of developmental mathematics education is to provide students with the necessary skills and understanding required to be successful in college level mathematics. It is not necessarily intended to be a repeat of high school mathematics. While many programs and initiatives have been developed to improve the state of developmental education, part of the problem lies in the content and courses taught. Mathematical Literacy for College Students (MLCS) is a new course being developed at the national level by AMATYC’s New Life for Developmental Mathematics. Its origins are related to Quantway, funded by the Carnegie Foundation. MLCS is an alternative path to certain college level math courses or further algebra. It integrates numeracy, proportional reasoning, algebraic reasoning, and functions with statistics and geometry as recurring course themes. Throughout the course, college success components are integrated with the mathematical topics. The course focuses on developing mathematical maturity through problem solving, critical thinking, writing, and communication of mathematics. Content is developed in an integrated fashion, increasing in depth as the course progresses. Upon completion of the course, students will be prepared for a statistics course or a general education mathematics course. Students may also take intermediate algebra upon completion if they choose to pursue STEM courses. MLCS provides an alternative to beginning algebra, creating multiple pathways for the developmental students. However, it is more rigorous than beginning algebra to ensure students are prepared for a college level math course upon successful completion. It allows students to potentially complete their developmental math and college level math requirement for an Associate in Arts degree in one year total (one semester each), working toward the goal of improving college completion rates. It promotes 21st century skills to prepare students for both the workplace and future coursework. Further, it does not diminish requirements for non-STEM college level math courses but instead creates appropriate paths to these courses with the same level of intensity and complexity as the current path through intermediate algebra. The course has college level expectations and coursework but with a pace and instructional design intended for the adult, developmental learner. This strategy emulates the approach taken by the Common Core Standards and aligns with them as well. 1|Page
  • 2. MLCS Course Description and Objectives Mathematical Literacy for College Students is a one semester course for non-math and non-science majors integrating numeracy, proportional reasoning, algebraic reasoning, and functions. Students will develop conceptual and procedural tools that support the use of key mathematical concepts in a variety of contexts. Throughout the course, college success content will be integrated with mathematical topics. Prerequisite: Appropriate placement or prealgebra with a grade of “C” or better COURSE OUTCOMES 1. Apply the concepts of numeracy in multiple contexts. 2. Recognize proportional relationships and use proportional reasoning to solve problems. 3. Use the language of algebra to write relationships involving variables, interpret those relationships, and solve problems. 4. Interpret and move flexibly between multiple formats including graphs, tables, equations, and words. 5. Demonstrate student success skills including perseverance, time management, and appropriate use of resources. 6. Develop the ability to think critically and solve problems in a variety of contexts using the tools of mathematics including technology. COURSE OBJECTIVES Upon successful completion of this course, the student will be able to: Numeracy 1. Demonstrate operation sense and the effects of common operations on numbers in words and symbols. 2. Demonstrate competency in the use of magnitude in the contexts of place values, fractions, and numbers written in scientific notation. 3. Use estimation skills. 4. Apply quantitative reasoning to solve problems involving quantities or rates. 5. Demonstrate measurement sense. 6. Demonstrate an understanding of the mathematical properties and uses of different types of mathematical summaries of data. 7. Read, interpret, and make decisions based upon data from line graphs, bar graphs, and charts. Proportional reasoning 8. Recognize proportional relationships from verbal and numeric representations. 9. Compare proportional relationships represented in different ways. 10. Apply quantitative reasoning strategies to solve real-world problems with proportional relationships. Algebraic reasoning 11. Understand various uses of variables to represent quantities or attributes. 12. Describe the effect that changes in variable values have in an algebraic relationship. 13. Construct and solve equations or inequalities to represent relationships involving one or more unknown or variable quantities to solve problems. 2|Page
  • 3. Functions 14. Translate problems from a variety of contexts into a mathematical representation and vice versa. 15. Describe the behavior of common types of functions using words, algebraic symbols, graphs, and tables. 16. Identify the reasonableness of a linear model for given data and consider alternative models. 17. Identify important characteristics of functions in various representations. 18. Use appropriate terms and units to describe rate of change. 19. Understand that abstract mathematical models used to characterize real-world scenarios or physical relationships are not always exact and may be subject to error from many sources. Student success 20. Develop written and verbal skills in relation to course content. 21. Evaluate personal learning style, strengths, weaknesses, and success strategies that address each. 22. Research using print and online resources. 23. Apply time management and goal setting techniques. Mathematical success 24. Develop the ability to use mathematical skills in diverse scenarios and contexts. 25. Use technology appropriately including calculators and computers. 26. Demonstrate critical thinking by analyzing ideas, patterns, and principles. 27. Demonstrate flexibility with mathematics through various contexts, modes of technology, and presentations of information (tables, graphs, words, equations). 28. Demonstrate and explain skills needed in studying for and taking tests. 3|Page
  • 4. Implementation Options MLCS is a 3 – 6 credit hour course depending on the depth and breadth desired. 1. Replacement Model: Use MLCS to replace beginning algebra. 2. Augmented Model: Use MLCS to create a non-STEM alternative to beginning algebra that provides sufficient preparation for statistics or liberal arts math. 3. Supplemental Model: Use MLCS lessons for problem solving sessions in an Emporium model (lab-based traditional redesign.), engaging all students and moving beyond skills alone. 4. High School Model: Use MLCS lessons for 4th year high school course to develop college readiness and help students place into college level math. 4|Page
  • 5. FP 80–90 min 3.12 Get in Line Explore On a comprehensive final exam, a professor asked each student to list the number of hours spent studying for the test. She chose a few of the students’ results and compiled them into 10 min a table. This helps her see trends that may prove useful for her future classes. Instructor note:  Instruct stu- dents to work on #1–6 in groups. Number of Hours Studied Test Score Out of 100 Go over answers. 0 62 1 66 2 70 3 74 4 78 6 86 9 98 1. Each time the number of hours increases by 1, the test score increases by 4 . Each time the number of hours increases by 2, the test score increases by 8 . Each time the number of hours increases by 6, the test score increases by 24 . Use each of these answers to write a ratio in the form increase in test score 4 = increase in number of hours 1   2. Since the ratios of increase in number of hours studied to increase in test score are ­always 4 , we can say there is a linear relationship b ­ etween the number of hours studied and the test score.  3. Write the slope with units and interpret it. Slope is 4 point/hour studied. For every hour studied, a student will gain 4 points on the final exam.     Instructor note:  We are using 4. Write a formula for the test score, T, based on the number of hours, h, a student studies. patterns and inductive reason- ing here. Formal equation writing T = 4h + 62 comes in Cycle 4. If students need a hint, remind them that the scores start at 62 and increase by 4. This idea is very useful for writing linear 5. Where is the slope in the table? In the equation? equations. The slope is the rate of change in the table. It is the coefficient of the independent variable in the equation. 6. Where is the number 62 in the table? In the equation? It was the score associated with 0 hours studied. It is the constant in the equation.     c
  • 6. LESSON 3.12 Get in Line 343 Discover Let’s look at this situation and the data using a graph. 20 min 7. Create a graph using the coordinate system provided. Instructor note:  Bring the Final Exam class together to complete #7–10. 100 Instructor note:  Discuss the 96 setup of the graph and the choices 92 for scales on the axes to expose students to the idea of domain (rea- 88 sonable values for the independent variable) and range (reasonable val- 84 Test score ues for the dependent variable). 80 It’s reasonable to have fractions and decimals for the hours studied 76 but not negative values. The hours can continue to increase somewhat, 72 but there is a physical limit. Also, 68 there is a limit to what the test score can be. 64 Draw a right triangle from (1, 66) 60 to (2, 70) on the line. Ask students for the rise and run of the triangle to find the slope of the line. m = 4 1 2 3 4 5 6 7 8 9 10 Hours studied (4 additional points for each hour studied). Explain that while we graphed the 8. Where do the slope and the number 62 appear on the graph? line by plotting points, we could use the slope to find more points The slope is the rise compared to the run when moving between points on the line. The on the line once a point on it is point (0, 62) is where the line crosses the y-axis. plotted. Let’s look more closely at how the equation of a line and its graph are related. A Closer Look Learn Intercept y look The point at which a graph crosses an axis is 6 called an intercept. If the graph crosses the x-axis, 5 the point of intersection is called an x-intercept. 4 it up If the graph crosses the y-axis, the point of inter- section is called a y-intercept. 3 2 1 For example, this graph has an x-intercept of –6 –5 –4 –3 –2 –1 0 1 2 3 4 5 6 x ( - 2, 0) and a y-intercept of (0, 4). –1 –2 –3 –4 –5 –6 The formula T = 4h + 62 is in a very useful form because it clearly shows the slope and y-intercept of the graph. The equation is in slope-intercept form.
  • 7. 344 Cycle 3 Instructor note:  Although it Slope-intercept form is conventional to look Linear graphs have equations that can be written in the form y = mx + b, called slope- use y = mx + b, it intercept form. x represents the independent variable, and y is the dependent variable. is often easier for When an equation is in slope-intercept form, the coefficient of x is the slope. The con- students to think of linear equations as y = b + mx. it up stant b represents the y-coordinate of the point where the line intersects the y-axis. The ordered pair (0, b) is the y-intercept. This order is used when graphing dependent variable independent variable with the slope and graphed on vertical axis graphed on horizontal axis y-intercept and it’s y = 50x + 200 how most contex- tual problems are described with an slope y-coordinate of y-intercept equation: a starting (change) (starting value) point and change from it. For example, imagine you have $200 in a savings account and you deposit $50 each month. This equation has m = 50 and b = 200. So the line has a slope of 50 and y-intercept of (0, 200). We can read these values only from an equation in slope-intercept form. Practice We have now learned that linearity can be seen from a table when there is a constant rate of change, on a graph when the points fall in a line, and in an equation of the form y = mx + b. Instructor note:  Remind Example 1  For each linear equation, list the slope and y-intercept. Remember, students that every number has a the y-intercept is an ordered pair, not a number. sign. Don’t separate the sign from a number. a. y = -3x - 2  m = -3, y-intercept is (0, -2) x 1 b. y = - 8  m = , y-intercept is (0, -8) 2 2 c. y = 4 - x  m = -1, y-intercept is (0, 4) practice 1  For each linear equation, list the slope and y-intercept. Remember, the y-intercept is an ordered pair, not a number. 5 min a. y = -x + 1  m = -1, y-intercept is (0, 1) Instructor note:  Instruct students to work in groups. Check b. y = -x  m = -1, y-intercept is (0, 0). answers and clear up issues. Signs and implied coefficients usually c. y = 4  m = 0, y-intercept is (0, 4). present a challenge. d. T = 4h + 62  m = 4, y-intercept is (0, 62). Let’s graph a linear equation in two ways. The first method requires finding points that appear on the line. Organizing the points into a table is helpful. The second method uses the slope and y-intercept. Example 2  Complete this table for the following linear equation: y = -5x - 6. 10–15 min x y Instructor note:  After going -1 -1 over answers to the practice problems, work with the class on 0 -6 ­example 2. 1 -11 2 -16
  • 8. LESSON 3.12 Get in Line 345 We can choose any values for x. The numbers in the table are whole numbers and are small, which make calculations faster. Notice that we are picking x, plugging it into the equation, and finding y. The value of y depends on whatever we choose for Instructor note:  Remind stu- x. We can connect the points with a line because the rate of change is constant, mak- dents that although only 2 points are needed to draw a line, a third ing the pattern linear. point provides a check. Plot the points and graph the line. y 20 18 16 14 12 10 8 6 4 2 x –20 –16 –12 –8 –4 0 2 4 6 8 10 12 14 16 18 20 –2 –4 –6 –8 –10 –12 –14 –16 –18 Instructor note:  The slope is –20 - 5, which is easier to work with as -5 the fraction . We can move down If you recognize the slope and y-intercept of a line, you can often graph it very 1 5 and to the right 1 from the quickly. To graph a line, we need to know a point to get a rough location on the grid y-intercept. Or we can think of the and also how the line is tilted. The y-intercept gives us a location, and the slope tells 5 the steepness. slope as and move up 5 and left -1 1. Do this again to get a third point. Find the slope from the equation y = -5x - 6 and verify it by finding the rate Students should notice that this of change in the table.  m = -5 graph is the same as the first graph. Find the y-intercept from the equation and verify it in the table.  (0, -6) Instruct students to work on prac- tice 2. Check answers. Ask which Plot the y-intercept. Use the rise and run of the slope to move to another point method they prefer. on the line. y 20 18 16 14 12 10 8 6 4 2 x –20 –16 –12 –8 –4 0 2 4 6 8 10 12 14 16 18 20 –2 –4 –6 –8 –10 –12 –14 –16 –18 –20
  • 9. 346 Cycle 3 3 practice 2  Suppose y = - x + 5. 4 5–10 min a. Graph this linear equation by making a table of points. To avoid fractional y-values, choose x-values that are multiples of the denominator of the slope. y 10 x y 9 8 -4 8 7 6 0 5 5 4 4 2 3 2 1 x –10 –9 –8 –7 –6 –5 –4 –3 –2 –1 0 1 2 3 4 5 6 7 8 9 10 –1 –2 –3 –4 –5 –6 –7 –8 –9 –10 b. Graph this linear equation by using the slope and y-intercept. -3 m = , y-intercept is (0, 5) 4   y 10 9 8 7 6 5 4 3 2 1 x –10 –9 –8 –7 –6 –5 –4 –3 –2 –1 0 1 2 3 4 5 6 7 8 9 10 –1 –2 –3 –4 –5 Instructor note:  Remind –6 students that we have used the –7 method of plotting points (as in –8 part a) throughout the book so far. –9 The method used in part b is a –10 shortcut but it only works for lines.
  • 10. LESSON 3.12 Get in Line 347 When working with real data, we need to be able to interpret the slope and y-intercept, not just find them. Keep in mind that slope compares the rise and run or the dependent and independent variables. We can use this idea to write a r ­ atio to interpret the slope. Example 3  If gas costs $3.65 per gallon with a $5.50 car wash, a formula for the cost (C) of g gallons of gas and the car wash is given by C = 3.65g + 5.50. 5 min This equation, or model of the situation, is also a function since there is only one cost ­ ssociated with each value of g. The equation is linear. If it helps, think of the a ­equation as y = 3.65x + 5.50. List the slope and y-intercept. m = 3.65, y-intercept is (0, 5.50)     The values of the slope and y-intercept matter, but their meaning is also important. change in y change in cost 3.65 Slope = = = change in x change in gallons 1 Interpret the slope in words:  For each gallon of gas, we will pay an additional $3.65. Interpret the y-intercept in words:  The car wash, without any gas, would cost $5.50. Instructor note:  Explain the Sticky Sticky Note. Instruct students to note work in groups for practice 3. Go over answers. Keep in mind that slope-intercept form does not have to use the letters y and x. If you see an equ ation in this form, it is in slope-intercept form: Dependent = Number  ~  Independ ent + Number     Variable        Variable          y =     mx       +   b The numbers, which represent the slope and y-intercept, can be positive, negative, or zero, and are not necessarily identical. Practice 3  For each problem, write an equation to model the situation. Interpret the slope and y-intercept in words. Also list which variable would be on the hori- 5–10 min zontal axis and which would be on the vertical axis. a. Model the cost if you buy an iPod for $200 and download songs for $1.29 each. C = 1.29s + 200 would give the cost, C, of the iPod and s songs. The slope gives the price per song of $1.29. The y-intercept would be (0, 200), indi- cating the cost of the iPod with 0 songs downloaded. The number of songs, s, would be on the horizontal axis. The cost, C, would be on the vertical axis.          
  • 11. 348 Cycle 3 b. Model the weekly salary a salesman earns if the salary is a combination of his base salary and commissions on his sales. His base weekly salary is $500 and he makes $50 for each sale. S = 500 + 50n, where n is the number of sales he makes and S is his weekly salary. The slope gives the commission per sale of $50. The y-intercept would be (0, 500), indicating his salary if he made 0 sales. The number of sales, n, would be on the hori- zontal axis. S would be on the vertical axis.           Connect In this cycle, we have defined linear equations as equations of the form ax + b = c, where a is not zero. But in this lesson, we have also referred to equations in y = mx + b form as 10 min linear. Let’s connect these ideas. Instructor note:  Complete #9 9. Suppose y = 2x + 4. y as a class. This ensures students will make the necessary connec- a. Graph the equation using the slope 6 tions between solving and graphing and y-intercept. 5 linear equations. 4 3 2 1 x –6 –5 –4 –3 –2 –1 0 1 2 3 4 5 6 –1 –2 –3 –4 –5 –6 b. Pick an ordered pair from the graph that appears to be on the line and confirm that the ordered pair is on the graph in part a. Answers will vary.    c. Pick another ordered pair from the graph that appears to be on the line and con- firm that the ordered pair is on the graph in part a. Answers will vary. d. How are the points on the line related to the equation y = 2x + 4? The coordinates of the points on the line are the solutions of the equation.    e. How do you know for sure that the point (-100, -196) is on the graph of the line y = 2x + 4 even though you cannot see it in the graph in part a? Since the ordered pair is a solution to the equation, the point must lie on the line.   
  • 12. LESSON 3.12 Get in Line 349 Reflect wrap-up lesson 5 min Instructor note:  Explain the What’s the point? contents of the Wrap-Up. Have stu- Linear situations can be seen in tables, graphs, and equations. dents write an answer to the cycle question, “Why does it matter?” What did you learn? A prompt is provided to help stu- dents. Discuss homework. How to find and interpret the slope and y-intercept from a linear equation How to graph lines using tables and slope and y-intercept Cycle 3 Question: When is it worth it? When is it worth drawing a graph to see and understand the slope? When are you able to get the information you need from the equation alone? Answers will vary. 3.12  Homework Skills  MyMathLab • Find and interpret the slope and y-intercept from a linear equation. • Graph lines using tables and slope and y-intercept. 1. List the slope and y-intercept:  y = 3 - 2x. m = -2, y-intercept is (0, 3)     2. Use the slope and y-intercept from #1 to form the graph. y 6 5 4 3 2 1 x –6 –5 –4 –3 –2 –1 0 1 2 3 4 5 6 –1 –2 –3 –4 –5 –6    
  • 13. 350 Cycle 3 Concepts and Applications • Find and interpret the slope and y-intercept from a linear equation. 3. For each situation, write a linear model. Find and interpret the slope and y-intercept. a. A student has $2,000 in debt from college loans, along with $500 payment for every month she has left to pay off her car. Model her total debt. D = 2,000 + 500m, where m = number of months and D = total debt The slope is 500, meaning she has an additional $500 of debt for each month that passes in which she has not paid off her car. The y-intercept is (0, 2000). This means that without the car debt, she would have $2,000 of debt.     b. A man has a starting weight of 205 pounds and is losing 10 pounds each month. Model his weight. W = 205 - 10m, where m = number of months and W = the man’s weight The slope is -10, meaning he is losing 10 pounds per month. The y-intercept is (0, 205). This means before he starts losing weight, when no months have passed, his weight is 205 pounds.     4. Imagine a company is offering newly hired employees three salary-pricing structures. One option computes raises by adding $1,000 and then a 3% increase. Another option computes raises by adding a 3% increase and then $1,000. A final option option com- putes raises by adding a 5% increase. a. Write a formula for computing the new salary under each plan, where NS = New Salary and S = Old Salary. Add $1,000; increase by 3%  NS1 = 1.03(S + 1,000) Increase by 3%; add $1,000   NS2 = 1.03S + 1,000 Increase by 5% NS3 = 1.05S b. In each formula, what is the independent variable?  S, the original salary in dollars What are the dependent variables? NS1, NS2, NS3 c. Using the formulas you created, complete the table below. All amounts are in dollars. Old Salary, S NS1 = 1.03(S + 1,000) NS2 = 1.03S + 1,000 NS3 = 1.05S 10,000 11,330 11,300 10,500 20,000 21,630 21,600 21,000 30,000 31,930 31,900 31,500 40,000 42,230 42,200 42,000 50,000 52,530 52,500 52,500
  • 14. LESSON 3.12 Get in Line 351 d. Simplify the first equation and list the three equations below. What do you notice about their slopes and y-intercepts? NS1 = 1.03S + 1,030 NS2 = 1.03S + 1,000 NS3 = 1.05S The slopes are the same for Options 1 and 2. The first equation’s value of b is exactly $30 more than the value of the second equation. The third equation has a different slope and y-intercept than either of the first two.        e. Of Options 1 and 2, which will always be better and why? Simplified, we can see that the rate of change is the same, but Option 1 will always be $30 more than Option 2.       f. Since the three lines are very close to each other, a specific graph is not helpful in this case. Instead, use only the y-intercepts and slopes to make a rough sketch of all three lines on the same graph. Use the fact that lines with the same slope are parallel. New Salary vs. Old Salary New salary Option 1 Option 2 Option 3 Old salary g. Solve an equation to determine for which original salary amount the first two o ­ ptions produce equal new salaries. 1.03(S + 1,000) = 1.03S + 1,000; no solution   There are no salaries for which the first two plans produce equal new salaries.     h. Solve an equation to determine for which original salary amount the second and third options produce equal new salaries. 1.03S + 1,000 = 1.05S; S = $50,000   For an original salary of $50,000, the second and third plans both produce the same new salary.    
  • 15. 352 Cycle 3 5. In the Explore, you looked at how the number of study hours is related to a student’s exam score. Imagine the professor’s data had instead been the following: Number of Hours Studied Test Score Out of 100 0 62 1 66 2 48 2 70 3 74 4 78 6 86 6 78 9 98 9 74 a. Does this data represent a function? Did the original data in the Explore represent a function? Explain. The original data represented a function, but this data does not since there are values of the independent variable that are matched with more than one value of the dependent variable.       b. What could the instructor do to get an equation to model the data?  Draw a scatterplot and find a trendline. 6. a. Do all lines have a y-intercept? Why or why not? No, vertical lines do not have a y-intercept (unless the vertical line is the y-axis).     b. What kinds of lines are not functions? Vertical     7. Decide whether or not each equation is linear. If necessary, complete a table to help you decide. If the equation is linear, identify the slope and the y-intercept. a. y = x - 4 linear slope = 1, y@intercept = (0, -4) b. y = 4 - x linear slope = -1, y@intercept = (0, 4) 1 c. y = - 4  not linear x
  • 16. LESSON 3.13 Gas Up and Go 353 1 d. y =   not linear (x - 4) 1 1 e. y = x  linear slope = , y@intercept = (0, 0) 4 4 , y@intercept = a0, bU      (x + 1) 1 1 f. y =   linear slope = 4 4 4