Question

It is not a function because both (2, 2) and (2,−2) have the same x-coordinate. It is a function because both (2, 2) and (2,−2) have the same x-coordinate. It is not a function because for each x-coordinate, there is exactly one y-coordinate. It is a function because for each x-coordinate, there is exactly one y-coordinate.

Answer 1

It is not a function because both (2,2) and (2,-2) have the same x-coordinate.

Explanation:

To be a function for the same x value there should NOT be two different y values.

So, in (2, 2) and (2,-2)

For the same x value 2, there are two different y values 2, -2.

So, this is not a function.