why x=y2-5y is not a function but y x2-5 is

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So the question is asking why x=y2-5y is not a function but x=y2-5y is not. The question also says to substitute -6 with x to solve for 1. (the 2 is an exponent just so you know). I solved y=66 in the first one, but got -1 for the second...??

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