P=2(L+W) L=2W+1 P=26 replace L in the first equation with its equivalent from the second, 2W+1. P=2(2W+1+W) DISTRIBUTE P=4W+2+2W -2 BOTH SIDES, SIMPLIFY P-2=6W Replace P with its equivalent from the third equation, 26 26-2=6W SIMPLIFY 24=6W DIVIDE BY 6 4=W Width=4.