Lauren has a square poster of a puppy on her bedroom wall. The width is one-sixth the length of the picture. If the width is 18 inches, write and solve an equation to determine the length.
6L = 18; L = 3 inches
L over 6 equals 18; L = 108 inches
6 + L = 18; L = 12 inches
L − 6 = 18; L = 24 inches