Question

Is the following relation a function?

Answer 1

Ok, so we can always test to see if something like this is a function by using the vertical line test. If you can draw a vertical line and hit more than 1 point, it is not a function.

If you draw a vertical line somewhere on this graph, is there any point where it will hit more than 1 point?

Answer 2

For example, look at the following two graphs.