The length of a rectangle is 3 cm greater than its width. The perimeter is 24 cm. what are the dimensions of the rectangle

P=2 (L+W)

P=24

24=2 (L+W)

12=L+W

Length is 3 greater than width

L=3+W

subsitute

12=3+W+W

12=3+2W

minus 3

9=2W

divide by 2

4.5=W

sub back

L=3+W

L=3+4.5

L=7.5

the rectangle is 7.5cm long and 4.5cm wide