Question

Determine which relation is a function.

A.


{(–4, 3), (–2, 3), (–1, 2), (2, 5), (3, 2)}


B.


{(–4, 1), (–2, 3), (–2, 1), (–1, 5), (3, 2)}


C.


{(–4, 1), (–2, 3), (–1, 2), (3, 5), (3, 2)}


D.


{(–4, 1), (–2, 3), (–1, 1), (–1, 5), (3, 2)}

Answer 1

Functions can only have 1 value of 'x'.

So the correct answer is A.

x-values in Option A:

-4, -2, -1, 2, 3

None of these are the same, therefore this is a function.