A publisher needs to send many books to a local book retailer and will send the books in a combination of small and large boxes. Each small box can hold 20 books and each large box can hold 40 books. There were twice as many large boxes sent as small boxes, which altogether can hold 400 books. Graphically solve a system of equations in order to determine the number of small boxes sent, x, x, and the number of large boxes sent, yy.