Question

Which of the following tables does not represent a function?
A.
x y
−8 9
−4 9
0 9
4 9
B.
x y
3 5
1 3
−2 0
−9 −7
C.
x y
4 −1
1 −4
4 1
1 4
D.
x y
−10 12
−4 6
2 0
8 6

Answer 1

C would not be a function. The test is for each x there can only be one y. X=4 in c has two y's, so it fails the test