Question 515333
I assume you mean the rental is $9 + 25 cents for each Mile driven.
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25 cents = 1/4 dollar
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C = (1/4)*M + 9
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where C = y-axis value and M = x-axis value
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{{{ graph(500,500,-5,50,-5,20,1/4*x+9) }}}
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You will have to adjust your graph to start at M=10.