Exercise 61 Page 650

We can check our answers by substituting the points into both equations. If they produce true statements, our solutions are correct. Let's start by checking $(\text{-}2,2).$ We will substitute $\text{-}2$ and $2$ for $x$ and $y,$ respectively, in Equation (I) and Equation (II). Since both equations produced true statements, the solution $(\text{-}2,2)$ is correct. Let's now check $\left(2,\text{-}2\right).$ Since again both equations produce true statements, the solution $\left(2,\text{-}2\right)$ is also correct.