1. The price for a basic cheese pizza at Giorgio's is $5. Each additional topping is $1. Sketch a graph to illustrate the relationship between the price of a pizza and the number of toppings for up to 5 toppings.
2. Reproductions of the National Gallery of Art's Girl with a Watering Can by Renoir are offered for sale in the gift shop.The manager finds that if she sets the price at $20, no reproductions are sold. For every dollar she reduces the price, 10 additional copies are sold each week. Sketch a graph showing the relationship between the price of a reproduction and the number sold each week.