Algebra Examples

${(2, 5), (2, 6), (2, 7)}$

Since $x = 2$ produces $y = 6$ and $y = 7$ , the relation $(2, 5), (2, 6), (2, 7)$ is not a function.

The relation is not a function.

$[\begin{array}{c} x^{2} & \frac{1}{2} \\ \sqrt{π} & \int x d x \end{array}]$