Help me solve this

Question

The perimeter of a rectangle is 80 ft the length of the rectangle is 4 feet more than three times the width what are the dimensions of the rectangle

Answer 1

P = 2 L + 2 w

80 = 2 (3w+4) + 2w

80 = 6w + 8 + 2w

80 = 8w + 8

72 = 8w

w=9

the width is 9

the length is 31