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Traffic Modeling matrix

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 Take an example:
 
    X + 2y = 7
    3X + 5y = 18 
 
     Eliminate X from the equation"
 
      -3  X  -6Y = -21
       3 X  + 5Y = 18
     _____________
      0 X -  y = -3            X + 2( 3) = 7
      0x  + Y  = 3             X = 7 -6  = 1
 
   In   Gaussian Elimination we set it in rows of numbers:  just did the same operation first found X, then 
       substitute in the first equation solved for Y. Your final answer should be 1's in diagonal and 0          
          elsewhere.
   
   -3)  1     2   l 7        -3    -6  l -21      0   -1 l -3       0    1  l 3     1   0 l 1
          3     5  l 18       3     5   l 18       3    5 l  18      3    0  l 3     0   1 l 3