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    yacotabaiwalu's Avatar
    yacotabaiwalu Posts: 3, Reputation: 1
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    #1

    Aug 4, 2010, 03:36 PM
    linear question
    it cost pacific printing $23 to print 200 business cards and $35 to print 500 business cards. Let y be the cost of printing x cards. Question? What is the cost function if it is linear?
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #2

    Aug 5, 2010, 01:54 AM

    If you let y = cost of printing and x = number of cards, then you can say that you have two points (x, y).

    So, you get:
    (200, 23) and (500, 35)

    You have two points, find the equation of the line passing through both points, having the form: y = mx + c where m is the gradient.

    The way I do this is finding the gradient first using

    Then, I use the gradient with one point (either one) and make y the subject of formula:



    Post what you get :)

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