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First of all, ALL functions are relations, but not all relations are functions.

To answer the question of whether or not this relation is a function, you want to know if any x value goes to more than one y value.

In this case it is easy. Look at what happens when x=0. At x = 0, your equation becomes y^2=4. Both y=2 and y=-2 satisfy that equation. So x=0 goes to two different y values.

It is a relation, but NOT a function.

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12y ago

What else can I help you with?