# Is the relation {(4, 2), (5, 2), (6, 2)} a function?

$\left\{\begin{matrix}4 & 2 \\ 5 & 2 \\ 6 & 2\end{matrix}\right\}$ is a function.
Each element of the Domain: $\left\{4 , 5 , 6\right\}$
maps into one and only one element of the Range: $\left\{2\right\}$