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Math Help - Matrix question

  1. #1
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    Matrix question

    Matrix question-matrixquestion.jpg


    Thank you everyone!
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  2. #2
    Senior Member yeKciM's Avatar
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    Quote Originally Posted by Oasis1993 View Post
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    Thank you everyone!

     2x-z=1 \Rightarrow z = 2x-1

     4y+az = -3 \Rightarrow 4y + a (2x-1) = -3 \Rightarrow 4y+2ax-a = -3

     9x-5y-7z=2 \Rightarrow 9x-5y -7(2x-1) = 2 \Rightarrow 9x-5y-14x+7 = 2

    so now you have

     2ax+4y =a -3

     -5x-5y = -5

    can you continue from here ?


    P.S. you should get something like :

    \displaystyle x = \frac {a-7}{2(a-2)}

    \displaystyle y= \frac {a+3}{2 (a-2)}

    \displaystyle z=- \frac   {5}{a-2}

    of course  a\neq 2
    Last edited by yeKciM; September 24th 2010 at 11:39 AM.
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  3. #3
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    hey! thanks so much for the reply, it's clearer to me now..however i don't understand how you reached those answers?
    I'd appreciate if you continued.

    thanks again.
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  4. #4
    Senior Member yeKciM's Avatar
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    Quote Originally Posted by Oasis1993 View Post
    hey! thanks so much for the reply, it's clearer to me now..however i don't understand how you reached those answers?
    I'd appreciate if you continued.

    thanks again.
    show what have you done... than well see where is the problem
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