Question 87135

a.  Define the variables.
  
Let w=width of rectangle
Then l=w+3=length of rectangle

b.Write the expression for the length in terms of the width.

l=w+3

c. Substitute what you know into equation. Be sure you only have one variable.

perimeter equals 2w+2l(but l=w+3)=24 in, so--

2w+2(w+3)=24 get rid of parens

2w+2w+6=24  subtract 6 from both sides

2w+2w+6-6=24-6  collect like terms

4w=18  divide both sides by 4

w=4.5 in-------------------width of rectang;e

w=l+3=4.5+3=7.5 in ---------LENGTH OF RECTANGLE

CK

24=2(4.5)+2(7.5)

24=9+15
24=24


Hope this helps----ptaylor