Help with algebra

Question

The length of a rectangle is 8 inches more than three times the width. The perimeter is 80 inches. Find the length and width.

Answer 1

Length = 3*width + 8

L = 3W+8

Perimeter (P) = 2*(W+L)

P=80

two equations and two unknowns

or insert L=3W+8 in P

80=2*(W+3W+8)

40=4W+8

4W=32

W=8 in

L=3*8++8=32 in