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# Function graphs

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While I was doing my algebra book, one of the questons was: Determine if each of the following graphs represents a function. (sorry I don't know how to post a picture so I'll try my best to describe) The first one is a squiggly line, the second is two segments, apart, and the third is a circle.

Right now I want to know if the squiggly line is a function, since I already know the second and third.

Feb 20, 2022

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I want to know if the squiggly line is a function, since I already know the second and third

Use desmos.com to draw the graph for y = sin(x) and see if that looks like your squiggly line.

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Feb 20, 2022
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If you start on the x-axis at the left-end of the graph and draw vertical lines up (or down) into the graph and keep doing this until you get to the right-end of the graph and none of these vertical lines cut the graph in more than one point, it is a function.

If one or more of these vertical lines cut the graph in more than one point, it is not a function.

Feb 21, 2022