Determine if the Relation is a Function {(1,3),(1,4),(1,5)}

${(1, 3), (1, 4), (1, 5)}$

Since $x = 1$ produces $y = 4$ and $y = 5$ , the relation $(1, 3), (1, 4), (1, 5)$ is not a function.

The relation is not a function.