Question

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

Answer 1

I believe the answer would be A.

Explanation:

Answer 2

A function cannot have the same value of x associated with different values of y.

Think about the straight line test!

The answer is a.