# Chapter P, Prerequisites - Section P.9 - Modeling with Equations - P.9 Exercises: 6

$r=\frac{d}{t}$ $t=\frac{d}{r}$

#### Work Step by Step

We solve for $r$ by dividing by $t$: $\displaystyle \frac{d}{t}=\frac{rt}{t}$ $r=\frac{d}{t}$ We solve for $t$ by dividing by $r$: $\displaystyle \frac{d}{r}=\frac{rt}{r}$ $t=\frac{d}{r}$

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