Robin helped her mom set a banquet table for dinner. She noticed that the width of the table was a third of its length. If the width is 9 feet, write and solve an equation to determine its length.
3L = 9; L = 3 feet
3 + L = 9; L = 6 feet
L over 3 equals 9; L = 27 feet
L − 3 = 9; L = 12 feet