## Functions Modeling Change: A Preparation for Calculus, 5th Edition

Rewrite $1$ as $\frac{z}{z}$ to get $$\frac{y}{y+z}=\frac{z}{z}+\frac{y}{z}$$ $$\frac{y}{y+z}=\frac{y+z}{z}$$ This is not correct, so the statement is false.