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-   -   World problems involving systems of equations with three variables (https://www.askmehelpdesk.com/showthread.php?t=293038)

  • Dec 16, 2008, 08:24 PM
    matticus0123456
    world problems involving systems of equations with three variables
    I got this problem for school and I don't really know where to start... :-(


    Suppose you are setting up for a small business and have invested $5000 to produce an item that will sell for $9. If each uniet can be produced for $7, how many units must you sell to break even?
  • Dec 17, 2008, 04:08 PM
    galactus
    There is not 3 variables here. Just one.

    Let x=number of units produced.

    You put up an initial 5000. Plus, it costs $7 to produce each.

    Therefore, the cost is 5000+7x

    But, you sell them for $9 each.

    The gross is then 9x.

    To break even they must be equal.

    Set equal and solve for x.

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