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Thread: help find the denominator

  1. #1
    Newbie
    Joined
    Nov 2009
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    6

    help find the denominator

    $\displaystyle x-y+3z=1,
    2x+z=0,
    -x+y-3z=0$

    Please let me know how to solve this question
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  2. #2
    Senior Member
    Joined
    Mar 2009
    Posts
    378
    I am not sure what the title of this thread has to do with the problem, but...
    To solve this you will want to solve for $\displaystyle x$ in the first equation, then substitute that into the second equation. Now solve for $\displaystyle y$ in the second equation, then substitute that and what you got for $\displaystyle x$ into the third equation. At this point the third equation should be in terms of $\displaystyle z$ only. Finally, sovle for $\displaystyle z$. This last step will give you a number. Now use this to determine $\displaystyle y$ and finally use both $\displaystyle y,z$ to determine $\displaystyle x$.
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