## Algebra: A Combined Approach (4th Edition)

R = $\frac{D}{T}$
Since D = RT, Dividing both sides by T, $\frac{D}{T}$ = $\frac{RT}{T}$ Since $\frac{T}{T}$ =1, $\frac{D}{T}$ = $\frac{R(1)}{1}$ = R Thus R = $\frac{D}{T}$