Question

If the formula for the perimeter of a rectangle is P=2l+2w, then w can be expressed as

Answer 1

 P=2l+2w, 
 P-2l=2l-2l+2w, 
P- 2l =2w
 (P-2l)/2=2w/2, 
w =  (P-2l)/2 or w = (P/2) - l