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Giovanna, I hope you realize that this is not trig... Anyhow, the only tricky bit here is dealing with the fact that both people and buses only come in wholenumber quantities. So for 1 person, 2 people... up to 45 people you need exactly 1 bus. And there should only be points for 0,1,2,... people; the graph should consist of dots, not one or more lines. It starts off a bit like this Good Hunting!
Giovanna, RD is correct, I should have plotted dots rather than lines. Penny  


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