Question 871214
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Hi
I. x - 2y + z = 8
<u> 2x - 6y - 11z = 4</u>
 11x - 22y + 11z = 88   I. x11
<u> 2x - 6y - 11z = 4</u>  
   13x -28y = 92 ***
-10x + 20y -10z = -80   I. times(-10)
<u>3x - 6y + 10z = 6</u>
  -7x + 14y = -74
   <u>13x -28y = 184</u>   
   -14x + 28y = -148   x2
   <u>13x -28y = 92</u> ***
         -x = -56
         x = 56,  y = 159/7  and z = -18/7