1. 8.1 relations and functions February 28, 2012
Solve for x.
1. 2x + 4 = 16
2. 3(­6x ­ 7) = 4x
3. x + 8 = 9
5
Bellwork
4. 12 ­ 6x = 10x + 15
Objective: identify and graph relations and functions
HW pg. 403 #1­5, 11­22 1

2. 8.1 relations and functions February 28, 2012
Relation ­ set of ordered pairs
{(25, 133), (22, 216), (24, 148), (22, 195), (20, 74), (21, 150)}
Domain ­ the first coordinates or the x coordinates
Range ­ the second coordinates or the y coordinates
Function ­ a relation where each domain is paired with exactly one range.
HW pg. 403 #1­5, 11­22 2

3. 8.1 relations and functions February 28, 2012
Is each relation a function? Explain.
[(0, 1), (1, 2), (1, 3), (2, 4)]
Domain Range
HW pg. 403 #1­5, 11­22 3

4. 8.1 relations and functions February 28, 2012
[(0, 1),(1, 2),(2, 2),(3, 4)]
[(0, 1), (1, 3), (2, 2), (3, 4)]
HW pg. 403 #1­5, 11­22 4

5. 8.1 relations and functions February 28, 2012
Graph the relation shown in the table.
Domain Range
­4 ­3
2 0
2 3
4 3
5 ­4
Use the vertical line test. Is the relation a function? Explain.
HW pg. 403 #1­5, 11­22 5

6. 8.1 relations and functions February 28, 2012
HW pg. 403 #1­5, 11­22 6

7. 8.1 relations and functions February 28, 2012
Page 403 # 1 ­ 5, 11 ­ 22 all
HW pg. 403 #1­5, 11­22 7