Question

Determine which relation is a function.

A.
{(–5, 1), (–5, 0), (–2, 1), (–1, 4), (6, 2)}

B.
{(–5, 1), (–2, 0), (–2, 2), (3, 4), (6, 2)}

C.
{(–5, 1), (–2, 0), (–1, 1), (2, 4), (6, 3)}

D.
{(–5, 3), (–2, 0), (–1, 2), (6, 4), (6, 3)}

Answer 1

Ooh, actually, I am totally wrong.

Answer 2

Its the other way around; make sure no x-value gives 2 y-values

Answer 3

if you have a bunch of ordered pairs, a quick way to determine a function is to see if you have the same x value for 2 or more points .
for example { (1,2) (1,3) } is not a function
but
{(1,2) (3,4)} is a function

Answer 4

so C is a function, since it doesnt have x repeats

Answer 5

Got it, thanks.