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You can use the vertical line test to determine if a relation is a function.

It's pretty simple: if there is any part of the graph where there are more than one of the same x-values for different y-values (ex. (3,2), (3,5), and (3,9)), the relation is not a function

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Q: What test is used to determine if a relation is a function?
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Related questions

What is the horizantal line test and vertical line test?

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