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Am I doing this right?

  1. Sep 12, 2011 #1
    1. The problem statement, all variables and given/known data

    The question says to find the general solutions of the systems, given the augmented matrices:

    1 3 4 l 7
    3 9 7 l 6



    2. Relevant equations



    3. The attempt at a solution

    1 3 4 l 7
    3 9 7 l 6 --> (-3)1st+2nd and simplified

    and got:

    1 3 4 l 7
    0 0 -5 l -15

    (-3)1st+2nd and simplified then got:

    1 3 4 l 7
    0 0 1 l 3

    and finally, (-4)2nd+1st:

    1 3 0 l -5
    0 0 1 l 3


    Does this look right? I'm just wondering if I got the correct answer. Thanks
     
  2. jcsd
  3. Sep 12, 2011 #2
    You correctly ranked the matrix, but where is your solution?
    It should be something like: (a,b,c) where a,b,c could be numbers or parameters.
     
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