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How do you know if something is not a function in math problems?

User Efthimio
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A function is an expression that takes up each value of an independent variable (x) and gives a corresponding value of a dependent variable (y) without the same values of the independent variable (x) giving different values of the dependent variable (y).

So, if a given group of data shows the same values of x that give different values of y, that relation is not a function.

Hope this Helps!!!

User Ssapkota
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