Naomi is a songwriter who collects royalties on her songs whenever they are played in
a commercial or a movie. Naomi will earn $20 every time one of her songs is played
in a commercial and she will earn $100 every time one of her songs is played in a
movie. Naomi's songs were played on 3 more commercials than movies, and her total
earnings on the royalties from all commercials and movies was $300. Graphically
solve a system of equations in order to determine the number of commercials, I, and
the number of movies, y, on which Naomi's songs were played.