posted by Nina .
Suppose that the length of a rectangle is 3 inches longer than the width and that the perimeter of the rectangle is 78.
Set up an equation involving only W, the width of the rectangle.
Assume all values are in inches.
L=length of rectangle
W=width of rectangle
P=perimeter of rectangle
P=L + W + L + W
The problem states:
L=W + 3
Substitute the above values into the perimeter equation.