Ariana is a songwriter who collects royalties on her songs whenever they are played in a commercial or a movie. Ariana will earn $40 every time one of her songs is played
in a commercial and she will earn $110 every time one of her songs is played in a
movie. Ariana earned a total of $500 in royalties on 9 commercials and movies. Write
a system of equations that could be used to determine the number of commercials
and the number of movies on which Ariana's songs were played. Define the variables
that you use to write the system.