help with this one

Question

The width of a rectangle is
4
inches less than the length. The perimeter is
36
inches. Find the length and the width.

Answer 1

Let L = length and W = width

 

W = L - 4 => L - W = 4

 

2(L + W) = 36 => L + W = 18

 

Add:

2L = 22 => L = 11 and then W = 7