In the graph, the horizontal axis plots the quantity of paper sold in tons per day from 0 to 70 in increments of 10. The vertical axis plots the price in dollars per ton from 0 to 9 in increments of 2 starting from 1. Two intersecting lines labeled S and D are drawn on the graph. The line labeled D moves diagonally downward from 9 on the vertical axis. The line labeled S moves diagonally upward from 1 on the vertical axis. These two lines intersect at a point 40 on the horizontal axis and 3 on the vertical axis.