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{(-2,9) (3,9) (-0.5,9) (4,9)} is it a function
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{(-2,9) (3,9) (-0.5,9) (4,9)} is it a function

User Jozzhart
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This is a function because none of the x axis numbers are the same. It doesn't matter if the y axis numbers are the same.
User Kazuaki
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