Bilquis and her children went into a movie theater and she bought $60 worth of bags
of popcorn and pretzels. Each bag of popcorn costs $7.50 and each pretzel costs
$3.75. She bought 2 more bags of popcorn than pretzels. Graphically solve a system
of equations in order to determine the number of bags of popcorn, x, and the number
of pretzels, y, that Bilquis bought.