Question

Which relation is a function?
help me
A.
{(7, 12), (1, –5), (3, –10), (2, –5)}

B.
{(1, 2), (1, 5), (1, –1), (1, 4)}

C.
{(–3, 4), (–2, 5), (0, 9), (0, 12)}

D.
{(8, –1), (2, –1), (3, 8), (2, 5}

Answer 1

Function is a relation where each x-coordinate pair with only one y-coordinate.

A is the only option where x-coordinates do not repeat. So A is the answer.