One month Chris rented 7 movies and 9 video games for a total of $71. The next month he rented 5 movies and 3 video games for a total of $31. Find the rental cost for each movie and each video game.
multiply the whole of the second equation by three to get: 7m+9v=$71 15m+9v=$31 now subtract the second equation from the first to get: 8m=$40 so a movie costs $5
now substitute the movie back into: 7(5)+9v=$71 35+9v=$71 9v=$36 so a video game costs $4
