2.2.29:  Granny's custom quilts receives an order for a patchwork quilt
made from square patches of three types: solid green, solid blue, and floral.
The quilt is to be 8 squares by 12 squares, and there must be 15 times as
many solid squares as floral squares. If Granny's charges are $3 per
solid square and $5 per floral square, and if the customer wishes to spend
exactly $300, how many of each type of square may be used in the quilt?

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2.2.37: Determine the number of solutions by graphing on the calculator, If
there is exactly one solution, estimate the values of x and y:

2x + y  =  12
3x - y  =   2
x  + 2y =  16