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Mathematics 91 Online
OpenStudy (newwar):

Which relation is a function? 1.https://static.k12.com/nextgen_media/assets/1348058-116039d.jpg 2.https://static.k12.com/nextgen_media/assets/243033-VHS_ALG_S2_01_L203_L303_LQ_3D.gif 3.https://static.k12.com/nextgen_media/assets/243030-VHS_ALG_S2_01_L203_L303_LQ_3A.gif 4.https://static.k12.com/nextgen_media/assets/243032-VHS_ALG_S2_01_L203_L303_LQ_3C.gif

OpenStudy (mrnood):

A function has only 1 value of y for each value of x so look at the 4 graphs and se if for ANY point on the x axis there are 2 values of y. If there are then it is NOT a function

OpenStudy (newwar):

ok i think #3 dose not have any y points

OpenStudy (mrnood):

in number 3 - can you find a value of x that has MORE than 1 y point?

OpenStudy (newwar):

no they are equal

OpenStudy (mrnood):

what is the value of y when x=3?

OpenStudy (newwar):

what is the equation

OpenStudy (mrnood):

you can see the line - it is vertical line through (3,0) (and 3,1)(and 3,1.1)(and 3,10001.112233)

OpenStudy (newwar):

i am sorry i dont get it

OpenStudy (mrnood):

look at the line in 3 is (3,0) on that line? is (3,1) on that line is (3,2.5) on that line?

OpenStudy (mrnood):

The equation for that line is x=3

OpenStudy (mrnood):

so - is there more than 1 value of y when x=3?

OpenStudy (mrnood):

Look at all the graphs the x values are vertical lines you need to find a graph where ANY vertical line only passes through the graph line ONCE|dw:1476746288072:dw|

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