Question

Which set of ordered pairs represents y as a function of x?

A) {(2, 5), (3, 1), (2, 1), (4, 7)}
B) {(3, 2), (4, 3), (5, 2), (2, 6)}
C) {(1, 3), (3, 5), (2, 5), (1, 6)}
D) {(4, 7), (4, 6), (4, 4), (4, 1)}

Answer 1

The answer is B

Explanation:

The only way you know that it's a function of X is if it's all different.

Answer 2

The only way it can be a function is if X is all different

So it has to be B