For a given week, Chau's Coffee House has available 1000 ounces of A grade coffee and 900 ounces of B grade coffee. These are blended into packages as
follows: a deluxe blend that contains 5 ounces of A grade coffee and 9 ounces of B grade coffee, and a special blend that contains 8 ounces of A grade coffee
and 4 ounces of B grade coffee. Let x be the number of deluxe blend packages sold. Let y be the number of special blend packages sold. Shade the region
corresponding to all values of x and y that satisfy these requirements.