Emily is a songwriter who collects royalties on her songs whenever they are played in a commercial or a movie. Emily will earn $40 every time one of her songs is played in a commercial and she will earn $120 every time one of her songs is played in a movie. Emily earned a total of $600 in royalties on 11 commercials and movies. Graphically solve a system of equations in order to determine the number of commercials, x, x, and the number of movies, y, y, on which Emily's songs were played.