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correct answer will get brainliest and full ratings, just direct message me the link of the problem so i won't forget : )

An expression that can only provide a single solution, y, for any given input, x, is called a “function”.

The given pairs are in the form (x,y)

Looking at set A:

(4,-2), (-2, 2), (2,-2), (4, 2)

Notice that if x=2, there are 2 y’s, -2 and 2. Therefore this set is not a function.

A is not a function

step-by-step explanation:

bob the banana