Which graph of a relation is not a function

Hi there!  

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I believe your answer is:  

Graph D

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Here’s why:  

A common method used for determining if a graph is a function is by conducting the vertical line test. Draw a vertical line through any section of the graph. If the graph intercepts the vertical line two times, then it is not a function. Graph D would fail the vertical line test, so it is not a function.

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Hope this helps you. I apologize if it’s incorrect.  

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