All pastes #372456 Raw Edit

Someone

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#372456 ·published 2007-02-26 01:48 UTC
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S1{   2x + y -3 = 2
  {    x - y    = 3 
  

This is the result my prof gave:

A1= [2  1  -1]
    [1 -1   0] 

i dont understand the -1 on first line, isnt it suppose to be -3 ?