Algebra Examples

$(1, 1)$ , $(2, 5)$ , $(- 2, 5)$ , $(1, - 1)$

Step 1

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

The relation is not a function.