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When looking at a function graph, which value determines whether a graphed relation is a function or not? Domain or Range? Explain why.
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When looking at a function graph, which value determines whether a graphed relation is a function or not? Domain or Range? Explain why.

User Mark Leighton Fisher
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It would be the domain, you can only have a unique y-value for each x, this is called the vertical line test. You can have the same y values for other points of y but not for the same point of x.
User Zygimantas
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