Question

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

Answer 1

the width is 6 and the length is 3 and the image shows how i solved it

Answer 2

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