31. 32.
188 CHAPTER 3 Graphs, Linear Equations, and Functions
x
y
0
3
–3
–4 4
x
y
0
2
3
Decide whether each relation defines a function, and give the domain and range. See Exam-
ples 1– 4.
51 1, 1 2 , 1 1, - 12 , 1 0, 0 2 , 1 2, 4 2 , 1 2, - 426 51 2, 5 2 , 1 3, 7 2 , 1 4, 9 2 , 1 5, 11 26
51 - 3, 1 2 , 1 4, 1 2 , 1 - 2, 7 26 51 - 12, 5 2 , 1 - 10, 3 2 , 1 8, 3 26
51 2, 4 2 , 1 0, 2 2 , 1 2, 5 26 51 9, - 22 , 1 - 3, 5 2 , 1 9, 2 26
51 5, 1 2 , 1 3, 2 2 , 1 4, 9 2 , 1 7, 6 26 51 8, 0 2 , 1 5, 4 2 , 1 9, 3 2 , 1 3, 8 26
2
5
11
17
3
1
7
20
1
2
3
5
10
15
19
27
- xy 20. 21. 22.
15
12
1
1 - 4
xy
0
4
xy
4
2
0
xy
1
3 - 6
23. 24. 25.
x
y
0
(–2, 2)
(0, 3)
(3, 2)
x
y
0
(–1, –3) (1, –3)
(4, 0) x
y
0
2
2
x
y
0
–2
2
x
y
0
2
2
x
y
0
2
2
x
y
0
–3
4
x
y
0
4
–2 2
26. 27. 28.
29. 30.