1. Lesson 89.Day2.notebook April 29, 2014
Assignment:
1-->System of equations Handout #2 - Due Tomorrow [4/30]
2-->Test #13 - Tuesday [5/6]

2. Lesson 89.Day2.notebook April 29, 2014
Lesson 89 (Day 2) WarmUp:
Find the volume of #1 & 2
1)
2)
3) Solve: 4(x - 3) + 5 = x + 2
4) The baby's weight increased from 15 to 21 pounds in 3 months.
What was the percent of increase?
5) Solve for y: y - 8 = 2x - 3
4 in
6 in
6 in
4 in

3. Lesson 89.Day2.notebook April 29, 2014
Lesson 89 - Day 2
*Another way to solve SYSTEMS OF EQUATIONS is by using
"substitution"!
Steps for using SUBSTITUTION:
--Isolate one of the equations for ONE of the variables
--Plug that "value" into the other equation and solve
--Plug this solution into the 2nd equations and solve.
--Write the solution as an ordered pair

4. Lesson 89.Day2.notebook April 29, 2014
EX--> x + y = 6
y = x + 10

5. Lesson 89.Day2.notebook April 29, 2014
Examples - Lesson 89
Solve each system of equations by Substitution. Check the solution.
A) y = x - 5
x + y = 3

6. Lesson 89.Day2.notebook April 29, 2014
B) x + y = 6
x - y = -10

7. Lesson 89.Day2.notebook April 29, 2014
C) x + y = 6
y = x

8. Lesson 89.Day2.notebook April 29, 2014
D) y = x - 6
x + y = 0

9. Lesson 89.Day2.notebook April 29, 2014
E) y = -x + 1
y = x + 5