The length of a rectangle is three more than its width. The perimeter is 86cm. Find the length and width of the rectangle. Write an equation and solve

P=2 (l+w)

Substitute width plus 3 for length

Remember order of operations: multiply before adding

86=2 ((w+3) + w)

86=2w+6+2w

86=4w+6

80=4w

20=w

23=w+3=l

Check the answer

86=2 ((w+3) + w)

86=2 ((20+3) + 20

86=2 (23+20)

86=46+40

86=86