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Mathematics 19 Online
OpenStudy (anonymous):

Which of these graphs represents a function? A) B) C) D)

OpenStudy (anonymous):

Directrix (directrix):

@Esi7023 Each x value of a function may be paired with exactly one y value for that x. So, you can use the vertical line test on the graphs to determine which is a function. If you pass a vertical line through the graph and the vertical line intersects 2 points of the graph, then that means one x value has been paired with 2 different y values for that x. Look at the attachment and see which graph has only one point of intersection with the vertical lines drawn.

OpenStudy (anonymous):

b

Directrix (directrix):

No. I did a bad job of drawing the vertical lines. The vertical line through the circle picks up two points. Look again at the red vertical line this time.

Directrix (directrix):

@Esi7023

OpenStudy (anonymous):

ok

Directrix (directrix):

So, the answer is what?

OpenStudy (anonymous):

c

Directrix (directrix):

Correct.

OpenStudy (anonymous):

thxs:)

Directrix (directrix):

You are welcome.

OpenStudy (anonymous):

:)

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