Question

Is the relation a function? Explain.

No, because for each input there is not exactly one output.
No, because for each output there is not exactly one input.
Yes, because for each input there is exactly one output.
Yes, because for each output there is exactly one input.

Answer 1

No, because for each input, there is not exactly one output. The input of -1 corresponds to two outputs, -2 and 3, so this is not a function.

Answer 2

no, because for each input there is not exactly one output

Explanation:

ordered pairs (-1,3) and (-1,-2) are are the same line