A line graph showing the interaction of supply and demand." Line graph showing how supply and demand intersect each other at the equilibrium price. The x-axis is labeled Quantity. The y-axis is labeled Dollars per Unit. The line labeled Supply increases in dollars per unit as quantity increases. At a quantity of 5, the price per unit is $10; at a quantity of 10, the price per unit is $20; at a quantity of 15, the price is $30 per unit; at a quantity of 20, the price is $40, at a quantity of 25, the price is $50. The line labeled Demand shows a decrease in price per unit as quantity increases. At a quantity of 5, the price per unit is $50; at a quantity of 10, the price per unit is $40; at a quantity of 15, the price is $30 per unit; at a quantity of 20, the price is $20, at a quantity of 25, the price is $10. The two lines intersect when quantity is equal to 15 and price is equal to $30." The equilibrium price and quantity depicted in the figure are, respectively, Multiple Choice $40 and 10 units. $30