Question

A formula for finding the perimeter of a rectangle is P=2L +2W . if you know the perimeter (P) and the length (L) of a rectangle, which formula can you use to find the width (W)?

Answer 1

The original equation is
P=2L+2W

We will just switch the unknowns around. To find width (W), we must isolate it in the equation by moving 2L over to the other side:

P-2L=2W

(P-2L)/2=W

W=(P-2L)/2

There you go!!

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