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Math Help - equation help

  1. #1
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    equation help

    ive been struggling with this problem for the last couple days, need help. i posted before, but i still cant figure it out.
    31x+12y-24z=105
    18x+24y+z=77
    12x-6y+4z=5
    when i do substitution, the problem seems to go on forever, and when i solve for an actual answer i get a differen number every time
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  2. #2
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    As you can see the solution is not very 'nice'.
    Attached Thumbnails Attached Thumbnails equation help-m2m.gif  
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  3. #3
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    sorry, that does not make any sense to me
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  4. #4
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    Quote Originally Posted by brandilee View Post
    sorry, that does not make any sense to me
    I am sorry too. I am sorry to see that response.
    Have you considered that you may not really understand the problem?
    It may be above the level of your mathematical development.
    If you simply need an answer then the highlighted yellow numbers are that.
    I am not sure what more you can demand? That is the answer!
    The fact is, this question requires a somewhat advanced mathematics.
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  5. #5
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by brandilee View Post
    ive been struggling with this problem for the last couple days, need help. i posted before, but i still cant figure it out.
    31x+12y-24z=105
    18x+24y+z=77
    12x-6y+4z=5
    when i do substitution, the problem seems to go on forever, and when i solve for an actual answer i get a differen number every time
    try elimination. try to eliminate one variable using two eliminations so you can make a new system of two equations and two unknowns. then solve those two. finding the third will be easy after that.

    do you understand?
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  6. #6
    Forum Admin topsquark's Avatar
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    Quote Originally Posted by brandilee View Post
    ive been struggling with this problem for the last couple days, need help. i posted before, but i still cant figure it out.
    31x+12y-24z=105
    18x+24y+z=77
    12x-6y+4z=5
    when i do substitution, the problem seems to go on forever, and when i solve for an actual answer i get a differen number every time
    Why don't you post your solution. Then we can look it over and give you feedback.

    -Dan
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