Question

Determine which relation is a function.

A.
{(–3, 2), (–1, 3), (–1, 2), (0, 4), (1, 1)}

B.
{(–3, 2), (–2, 3), (–1, 2), (0, 4), (1, 1)}

C.
{(–3, 3), (–2, 3), (–1, 1), (0, 4), (0, 1)}

D.
{(–3, 2), (–2, 3), (–1, 1), (0, 4), (0, 1)}

Answer 1

You know if something is a function or not because the X will never be used twice in a set. If it is, then it's not a function.
A. Uses -1 twice
B. Uses Nothing twice (good)
C. Uses 0 twice
D. Uses 0 twice
B is your answer