Jim gives the cashier a $20 bill at the pharmacy. Write an equation that relates the change c he gets back in dollars to the cost b, in dollars, of his purchases. Which variable represents the independent variable? How much change does he get back if his purchases total $12.83?

b= 12.83

c= 7.17

Variable "c" is independent because it does not change. Jim receives $7.17 back.

a function could be identified in 3 ways either on a chart,graph, or ordered pairs. first a function is that each point has its own. the rule is that there can be many x's to one y but there can not be 2 x's at different y's. so on a graph when you put a straight line through the y's there should be one dot only to be a function.

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ok so what's the question?

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