Perimeter(P)= 2w+2l= 72 (simplify expression: divide each side by 2 ) P= w+l= 36 (plug in "2w" for "l") P= w+(2w)= 36 P= 3w= 36 (divide each side by 3 to find the width) w= 12 units
find length: l=2w l= 2(12) l= 24 units
Answer: The length of this rectangle is 24 units and the width is 12 units.