It is convenient to use x and y for the cost of 1 package each of cupcakes and brownies, respectively.
3x +2y = 19 . . . . . . . . Amanda's purchase
2x +4y = 24 . . . . . . .. Shan Shan's purchase
The graph of these equations shows the point of intersection to be
(x, y) = (3.50, 4.25)
The cost for 1 package of brownies is $4.25
The cost for 1 package of cupcakes is $3.50
