Question

{(-3,3), (-4,5), (-5,6), (-1,7),(-3,8)} function? Why?

Answer 1

No, it's not a function because two of the inputs (x-coordinate) are the same (the -3 and the -3) If two inputs are the same and have different outputs it is no longer a function. Therefore since the two inputs are the same and have different inputs the problem is not a function.