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Math Help - solve by elimination

  1. #1
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    solve by elimination

    I need help please solving the following with the elimination method:
    3r-2s=17 and 2r+3s=33 Thanks for any help!
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  2. #2
    Rhymes with Orange Chris L T521's Avatar
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    Quote Originally Posted by jay1 View Post
    I need help please solving the following with the elimination method:
    3r-2s=17 and 2r+3s=33 Thanks for any help!
    I would recommend eliminating the variable 's' because one of the 's' variables in the system is negative. So now, what is the least common multiple of 2 and 3? Keeping that in mind, multiply each equation by the "missing factor" in the least common multiple. Next, add the two equations together; if you did everything correctly, the 's' variable should drop out and you'll be left with something of the form ar=b which is relatively simple to solve. Lastly, now that you know 'r', you can plug it into either equation to find 's'.

    I hope you can make sense of this. Please post back if you have further difficulties.
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  3. #3
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    HINT:
    a + b = 20
    a - b = 12
    ========
    2a = 32
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