Question

Which relation is a function?

Answer 1

A relation can only be a function if every x-value only has one y-value.

For answer A, x = -3 returns two y-values of -3 and -5, so it cannot be a function.

For answer B, x = 2 returns two y-values of 3 and 5, so it cannot be a function.

For answer C, x = 2 returns two y-values of -1 and 1, and x = 3 returns two y-values of -4 and 4, so it cannot be a function.

The answer is D, as no x-value returns two y-values in the table.

Answer 2

In order for it to be a function there cannot be 2 of the same x’s so unless there is another choice other than A, B, or C then there is no correct answer