# How do you find the domain and range and is it a function given points {(4,-2), (4,2), (1,-1), (1,1), (0,0)}?

The domain is $\left\{0 , 1 , 4\right\}$
The range is $\left\{- 2 , - 1 , 0 , 1 , 2\right\}$
or $x$ values. The range is a set containing all possible unique outputs or $y$ values. For this set to describe points on a function('s graph), multiple inputs are allowed to yield the same output, however, if even one input can yield multiple outputs, we know for sure that we are not dealing with a function. Here, $4$ can either give back $- 2$ or $2$and $1$ can either give $- 1$ or $1$ on the output.