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Math Help - Question about cases

  1. #1
    Junior Member
    Joined
    Sep 2009
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    62

    Question about cases

    I need to prove if ad-bc=/=0 then the reduced row echelon from of matrix

    a b
    c d

    is

    1 0
    0 1

    I have the cases where
    1) a,b,c,d =/= 0
    2) a = 0, b,c =/= 0
    3) b = 0, a,d =/= 0
    4) c = 0, a,d =/= 0
    5) d = 0, b,c =/= 0

    Close? Or what? Thanks.
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  2. #2
    Super Member TheChaz's Avatar
    Joined
    Nov 2010
    From
    Northwest Arkansas
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    Re: Question about cases

    How about doing rowops to get
    ac bc
    ac ad
    And subtract
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