## Thinking Mathematically (6th Edition)

$P=\dfrac{A}{1+rt}$
Divide $(1+rt)$ on both sides of the equation to obtain: $\dfrac{A}{1+rt}=\dfrac{P(1+rt)}{1+rt}$ Cancel the common factors to obtain: $\require{cancel} \\\dfrac{A}{1+rt} = \dfrac{P\cancel{(1+rt)}}{\cancel{1+rt}} \\\dfrac{A}{1+rt} = P$