Cameron is a songwriter who collects royalties on his songs whenever they are played in a commercial or a movie. Cameron will earn $50 every time one of his songs is played in a commercial and he will earn $150 every time one of his songs is played in a movie. Cameron earned a total of $900 in royalties on 10 commercials and movies. Graphically solve a system of equations in order to determine the number of commercials, x, commax, and the number of movies, y, commay, on which Cameron's songs were played.