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

@robtobey @ShadowLegendX

Answer 2

Plot each point in each set. Focus on only one set at a time

If it is possible to draw a vertical line through more than one point, then the relation is NOT a function.

Answer 3

Alright

Answer 4

Example:

Say we had this relation
{(1,2), (5,4), (7,8), (1,10)}

The two points (1,2) and (1,10) will line up. (1,10) will be directly above (1,2). It is possible to draw a vertical line through both points. So in this example, the relation is NOT a function

Answer 5

Ok. Thank you!

Answer 6

you're welcome

Answer 7

So my answer would be A?

Answer 8

@jim_thompson5910

Answer 9

Anybody? Is my answer A?

Answer 10

yep the others fail the vertical line test

Answer 11

Thanks!

Answer 12

the vertical line test is a test where you see if a vertical line passes through more than one point

Answer 13

no problem