Francisco is a songwriter who collects royalties on his songs whenever they are played
in a commercial or a movie. Francisco will earn $30 every time one of his songs is
played in a commercial and he will earn $90 every time one of his songs is played in a
movie. Francisco earned a total of $360 in royalties on 8 commercials and movies.
Graphically solve a system of equations in order to determine the number of
commercials, a, and the number of movies, y, on which Francisco's songs were
played.
