SOLUTION: 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 a n answer, P-2w=2L. What error did the student make? Exp

Algebra ->  Expressions-with-variables -> SOLUTION: 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 a n answer, P-2w=2L. What error did the student make? Exp      Log On


   

Question 991520: 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 a n answer, P-2w=2L. What error did the student make? Explain. Then solve for L.
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
Student did not finish. He stopped at finding 2L, but he was assigned to solve for L. Missing step is multiplication property of equality, using the multiplicative inverse of 2.