i do not understand ant of this at all

Question

A frame around a family portrait has a perimeter of  inches. The length is ten less than twice the width. Find the length and the width of the frame.

Answer 1

Length L

width w

Length is ten less than twice the width..

L = -10 + 2w

= 2w - 10

Perimeter is 88

L + L + w + w = 88

(2w-10) + (2w-10) + w+ w= 88

6w - 20 = 88

6w = 108

w = 18

width is 18

length is 2(18)-10 = 36-10 = 26

CHECK: 26+26+18+18 = 52+36 = 88

so yes it checks

26 by 18 are the dimensions