#### Answer

The DOMAIN of a set of points includes all the x values. Points are always written (x, y). Although there are five points in this list, there are only four x values: 2, -1, 0, and 4 (-1 is repeated, so this can not be a function). Put these numbers in order from smallest to largest and list them as a series with brackets like this: {-1, 0, 2, 4}.

#### Work Step by Step

The domain of a function includes all of the x-values. In each ordered pair, there is (x,y) therefore, take out the x.
$(2,-3)$-->$2$
$(-1,0)$-->$-1$
$(0,4)$-->$0$
$(-1,5)$-->$-1$
$(4,-2)$-->$4$
That gives you the numbers $2, -1, 0,$ and $4$.