F={(-12)} is f a function and why/why not

No, because x=-1 is assigned to more than one y; those y's are 0 and 2.

Step-by-step explanation:

A set of points is a function if there is only one y assigned to an x.

A set of points that has an x that gets assigned to more than one y is not a function.

Here we have the latter because x=-1 is assigned to more than one y; those y's that x=-1 is assigned to is 0 and 2. Therefore the set is not a function.

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