Question 187596
"The perimeter of a rectangle is 144m" ___ 2L + 2W = 144


"The length is 9m more than twice the width" ___ L = 2W+9


SUBSTITUTING ___ 2(2W+9) + 2W = 144 ___ 4W + 18 + 2W = 144 ___ 6W = 126 ___ W = 21


substituting (again) ___ 2L + 2(21) = 144 ___ 2L + 42 = 144 ___ 2L = 102 ___ L = 51