A paper company needs to ship paper to a large printing business. The paper will be shipped in small boxes and large boxes. Each small box of paper weighs 25 pounds and each large box of paper weighs 50 pounds. There were 4 more large boxes shipped than small boxes and the total weight of all boxes was 800 pounds. Graphically solve a system of equations in order to determine the number of small boxes shipped, x, x, and the number of large boxes shipped, yy.