Question

How do you know if (5,-7) (6,-7) (-8-1) (0,-1) is a function?

Answer 1

:)

Explanation:

The best way to imagine a function is a Vertical Line test. That is, if you plot every point given, can you draw a vertical line that passes through more than one point? If yes, then it's not a function.

For these points, every `x` value is unique, so no Vertical Line can be drawn as described above, so it is a function.