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Math Help - help with simultaneous equations 3 unknownes

  1. #1
    Newbie
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    Dec 2008
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    help with simultaneous equations 3 unknownes

    hi anyone help me totally stuck on this question thanks first time on forum.
    3r-2t=0.2
    r+s=2.4
    4s-t=7.3
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  2. #2
    Junior Member
    Joined
    Nov 2008
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    Thatīs what I did:
    First eliminate r from the 1st and 2nd equation
    3r-2t=0,2
    -3r-3s=-7,2
    -----------
    -3s-2t=-7,0

    Now eliminate t from this one and the 3rd equation
    3s+2t=7,0
    8s-2t=14,6
    -----------
    11s=21,6

    so s=21,6/11 I donīt know if you want to give an approximate of that number, if you want its exact value, it is s=108/55
    Now you can start the back-substitution in order to get t and r

    Hope it helped...
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  3. #3
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    thanks for that big help cheers
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