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Math Help - Finding linear cost function.

  1. #1
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    Finding linear cost function.

    Im a little confused on how to come up with the linear cost function here:


    Regrind, INC, regrinds typewriter platens. The variable cost to regrind each platen is $1.40. The total cost to regrind 70 platens is $400. Find the linear cost function to regrind platens. If regrind platens sell for $9.40 each, how many must be reground and sold to break even ?
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  2. #2
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    The linear cost has the model C=aN+b where C is the cost and N is the number of typewriter platens reground.

    a = 1.4 as it is a "per" cost giving C=1.4N+b now substitute (N,C)=(70, 400) into this equation to find b
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    Thanks...
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