A store charges their customers based on the number of items that they buy. Jane bought four items and was charged $15 and George bought twelve items and was charged $39. Write a function to model the cost based on the number of items you buy. Then determine how much you bought if you were charged $33.
A)
f(x) = 3x + 3; f(10) = 33
B)
f(x) = 3x + 3; f(33) = 102
C)
f(x) =
1
3
x + 3; f(90) = 33
D)
f(x) =
1
3
x + 3; f(33) = 14

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Use the points (4, 15) and (12, 39) and find the equation of the line that passes through them.

@mathstudent55 This is a word problem, please read above, there is nothing to do with graphs here.

@phi

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