1. Represent Relations
and Functions
Section 2.1

2. Relations
•A mapping, or pairing, of input
values with output values.
•The set input is known as the
domain.
•The set of output is known as the
range.

3. Relations
Ways to represent relations.
• Table
• Mapping Diagrams
Input Output
Input
(liters)
1 5 12 15
Output
(wons)
2000 10,000 24,000 30,000
1
2
3
5
0
1
2

4. Relations
Ways to represent relations.
Ordered Pairs
• (-2, 2)
• (3, 4)
• (1, 7)
Graph

5. Functions
•
y = 8000xx yy = 8000x

6. Functions
Input Function Output
Domain Range
x yy = 8000x
A functions is a relation for which each input has
exactly one out put. If any input of a relation has
more than one output, the relation is not a function.

7. Function or Not
1
3
5
0
1
2
Input 0 7 8 7 23
Output 1 5 8 5 10

8. Function or Not
(2, 3), (3, 4) (-1,3), (4, 3)

9. Homework
Handout
Writing Equations of Lines
Pages 76-77
#3-7 odd, 10-13 all, 21-23 all
Page 86
#19-27 odd
Page 93
#9-19 odd