Question

Which relation is a function?


A. http://static.k12.com/calms_media/media/243500_244000/243590/1/172e305112dd80ece4ce2adc0856375501d285b1/VHS_PA_S2_02_L214_L314_UT_Q6c.gif

B. http://static.k12.com/calms_media/media/243500_244000/243589/1/2231af4e069a985c07b54cc1ccaee221ffe20717/VHS_PA_S2_02_L214_L314_UT_Q6b.gif

C. http://static.k12.com/calms_media/media/243500_244000/243591/1/995c049dff7ac7d6ece641f374948644f14061e7/VHS_PA_S2_02_L214_L314_UT_Q6d.gif

D. http://static.k12.com/calms_media/media/243500_244000/243588/1/6084b4a1e2da4017b5c4ee03e0ca3d7481f5cd5e/VHS_PA_S2_02_L214_L314_UT_

Answer 1

Do you the vertical line test?

Answer 2

what?

Answer 3

A function is only true if a x-value has only one y value

For example, (2,3) and (2,4) is not a function because the same x value, 2, has two different y values

Answer 4

A vertical line test is a test where you draw a vertical line on your graph. If the vertical line crosses the graph only once at each x value, then your graph is a function