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? Complete the explanation. Then solve for ℓ.

Answer 1

So the student was correct in subtracting 2w from both sides, however, he cant solve for l unless he divides 2 on both sides so the l becomes by itself :)