Question

The length of a rectangle is 2 ft longer than its width. If the perimeter of the rectangle is 36ft, find its area

Answer 1

l=w+2
36=2l+2w
36=2(w+2)+2w
36=2w+4+2w
36=4w+4
0=4w+4-36
-4w=4-36
divide everything by -4
w=-1+9
w=8
l=8+2=10
8*10=80
a=80ft^2