The legth of a rectangle is three centimeters less than twice its width. if the perimeter of the rectangle is 18 centimeters, find its dimensions

Question

Mathematics

Haylee

23 March, 23:08

The legth of a rectangle is three centimeters less than twice its width. if the perimeter of the rectangle is 18 centimeters, find its dimensions

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Answers (1)

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Irvin Smith · Answer 1

P=2 (L+W)

L=-3+2W

P=18

18=2 (L+W)

divde 2 both sides

9=L+W

sub - 3+2W for L

9=-3+2W+W

9=-3+3W

add 3 both sides

12=3W

divide both sides by 3

4=W

sub back

L=-3+2W

L=-3+2 (4)

L=-3+8

L=5

it is 5cm by 4cm