# What is the domain and range of {(-1, -2), (1, -2), (3,1)} ?

Given $\left(x , y\right) \in \left\{\begin{matrix}- 1 & 2 \\ 1 & - 2 \\ 3 & 1\end{matrix}\right\}$
the domain is $\left(- 1 , 1 , 3\right\}$ and
the range is $\left\{- 2 , 1\right\}$
The domain is the collection of valid values for $x$.
The range is the collection of valid values for $y$