Question

Which point could be removed in order to make the relation a function?

{(–4, 3), (–5, 6), (1, 0), (–4, 5), (9, 5), (0, –7)}

Answer 1

Every unput (x value) must have a unique output (y value) for a relation to be considered a function.

The vertical line test can be used to determine if a relation is a function.

If you can draw a vertical line that goes through a relation more than once it is a function

This is a function by the vertical line test:



This is NOT a function by the vertical line test:


It fails the vertical line test, a line can pass through it more than once