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Which represents a function? Edge 2020.

Which represents a function? Edge 2020.-example-1
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User Daveywc
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The data set {(-8,-2),(-4,1),(0,-2),(2,3),(4,-4)} represents a function because for every distinct input x has only one output y, whereas all the other data sets have at least one point of x in which has two or more outputs of y.
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User Nelson M
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