The width of a rectangle is 9 less than the length. if the perimeter is 130 cm, find the length and the width of the rectangle.

The formula of a perimeter of a rectangle:

l - length

w - width

We have

w - width

w + 9 - length

130 cm - perimeter

Substitute:

           divide both sides by 2

         subtract 9 from both sides

      divide both sides by 2

answer: (3,11) is your answer.

i would say true? if the unit was informational and it "refreshed your understanding", then true.