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Math Help - Modeling with Functions

  1. #1
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    Unhappy Modeling with Functions

    Modeling functions kill me, my brain malfunctions when I try them. I can do easy ones but then they get really complicated. Help with this one would be appreciated.

    You have a $70 coupon from the manufacturer good for the purchase of a cell phone. The store where you are purchasing your cell phone is offering a 40% discount on all cell phones. Let x represent the regular price of the cell phone.

    (a) Suppose only the 40% discount applies. Find a function f that models the purchase price of the cell phone as a function of the regular price x.

    (b) Suppose only the $70 coupon applies. Find a function g that models the purchase price of the cell phone as a function of the sticker price x.
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  2. #2
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    (a) f(x) = .6x

    (b) g(x) = x - 70
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  3. #3
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    I guess I can see how you got g(x) but I don't understand how you got f(x). Could you explain how you got there?
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  4. #4
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    when you get a 40% discount, you only pay 60% of the cost.
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