Question

Determine which relation is a function.

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

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

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

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

please help me i dont get IT AT ALLL!!!!!!!!!!!!!!

Answer 1

You have a bunch of ordered pairs.
If an x-coordinate shows up more than once, then `it is not a function`.

Example, if you have a set containing (0,4) and (0,1),
then it is not a function,
because x=0 is being sent to two different places, 4 and 1.

Answer 2

so is the answer b or d

Answer 3

In option B, see how the x=0 shows up in two places?
No bueno.

Answer 4

In option D, x=-1 is showing up twice.
Bad bad bad.