## Discrete Mathematics with Applications 4th Edition

a. Yes. Yes. No. No. b. $V=\{(-2,6), (0,4), (0,8), (2,6)\}$ c. The domain is $G=\{-2,0,2\}$. The range is $H=\{4,6,8\}$. d.
Be careful with negatives: $\frac{(-2)-6}{4}=-2$, $\frac{0-4}{4}=-1$, $\frac{0-8}{4}=-2$, and $\frac{2-6}{4}=-1$.