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Simple Linear Algebra Problem

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


    3. The attempt at a solution

    To get to the stuff in the picture, I subtracted [ 6 -7; -1 -2] from both sides and then multiplied on the left by the inverse of [1 8; -5 -3]

    Where'd I go wrong?
  2. jcsd
  3. Sep 1, 2011 #2
    wait. just verified that my mental math sucks. found the error.
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