Algebra Examples

$F = {(2, 5), (3, 4), (4, 6), (2, 1), (7, 2)}$

Since $x = 2$ produces $y = 5$ and $y = 1$ , the relation $(2, 5), (3, 4), (4, 6), (2, 1), (7, 2)$ is not a function.

The relation is not a function.

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