<PRE><B>Question 571187</B>
Let L be length: L = 2W-6
    W be width : W = W
Perimeter is 72 inches.
Formula of Perimeter of a Rectangle: P=2L+2W
easily substitute L = 2W-6 to Length ,and W = W to Width

So, P= 2L+2W
by substitution P=72
 72 = 2(2W-6) + 2W
 72 = 4W - 12 +2W
 72 + 12 = 6W
 86 = 6W
 so, 
  W= 14 

and subs the value of W to L

 L= 2W -6
  = 2 (14) -6
  = 28 - 6
  = 22 

Th answer is 22 by 14.</PRE>