Question

Which table does NOT represent a function?

A.
x f(x)
0 1
2 3
3 4
4 5
5 6
6 7


B.
x f(x)
-3 9
-2 4
-1 1
0 0
1 1
2 4


C.
x f(x)
0 3
2 3
3 3
4 3
5 3
6 3 


D.
x f(x)
0 -1
2 3
0 4
2 5
0 6
2 7

Answer 1

Its D  because its a one-to-many relation ( note  2 maps to 3 and also maps to 5), o0maps to -1 and also to 4 and 6)