Suppose you belong to a tennis club that has a monthly fee of $100 and a charge of $5 per hour to play tennis. Suppose you start with 10 hours of tennis and then decide to increase your tennis time by 3 hours. On your curve show the initial point and the new point. By how much will your monthly bill increase? Suppose you start with 10 hours and then decide to spend and additional $30 on tennis. On your curve show the initial point and the new point. How many additional hours can you get?

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