contestada

Which relation is a function?

A. x y
4 -2
5 -3
6 -2
7 -3


B. x y
3 10
2 20
3 30
4 40
C. x y
-5 2
-5 3
-10 4
-10 5

D. x y
10 15
20 25
8 30
20 35