Question

1. solve for l: p = 2l + 2w (perimeter of a rectangle)
2. solve for t: d = rt (linear motion)

Explanation:

Step1: Isolate the term with L

Subtract 2W from both sides of the equation $P = 2L+2W$.
$P - 2W=2L$

Step2: Solve for L

Divide both sides by 2.
$L=\frac{P - 2W}{2}$

Step3: Isolate t in $D = rt$

Divide both sides of the equation $D = rt$ by r (assuming $r
eq0$).
$t=\frac{D}{r}$

Answer:

$L=\frac{P - 2W}{2}$
$t=\frac{D}{r}$