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Math Help - Solving word problems with 2 variables

  1. #1
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    Solving word problems with 2 variables

    So I figured out most of this chapter but in the exercises they give you problems that they don't even give examples of in the book

    Can someone please show me how to do these step by step?


    http://i1209.photobucket.com/albums/...g?t=1333821915

    Number 35, with x and y variables. I just need to know how I would format this problem



    2012-04-07130457.jpg picture by King_Bradley - Photobucket

    Number 43

    2012-04-07130841.jpg picture by King_Bradley - Photobucket

    Number 17

    I just need to know how to format these problems with 2 variables representing something
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  2. #2
    MHF Contributor

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    Re: Solving word problems with 2 variables

    #35. Mahmud invested $6000 in two accounts, some of it at 4% simple interest, the rest of it in an account earning 2% simple interest. How much did he invest in each account if he earned $190 in interest after 1 year?
    Start by "naming" things. Let "x" be the amount of money invested at 4% interest. The interest on that is .04x. Let "y" be the amount invested at 2% interest. The interest on that is .02y.

    The total invested is $6000: x+ y= 6000
    The total interest is $190: .04x+ .02y= 190.

    Solve that, then try the others.
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