Question

A student was asked to use the formula for the perimeter of a rectangle, P = 2l + 2w, to solve for l. The student came up with an answer, P -2w=2l. What error did The student make? Explain. Then solve for l

Answer 1

The student solved for 2l, not l. Dividing P -2w=2l by 2, we get l=P/2-w