Ava went to the grocery store and bought bottles of soda and bottles of juice. Each bottle of soda has 40 grams of sugar and each bottle of juice has 20 grams of sugar. Ava purchased a total of 11 bottles of juice and soda which collectively contain 400 grams of sugar. Graphically solve a system of equations in order to determine the number of bottles of soda purchased, x, x, and the number of bottles of juice purchased, yy.