Question 689376
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<pre>

  1  -1   0   7
  0   1  -1  -3
  1   0   1   4

-R1 + R3 -> R3

  1  -1   0   7
  0   1  -1  -3
  0   1   1  -3 

-R2 + R3 -> R3

  1  -1   0   7
  0   1  -1  -3
  0   0   2   0

R3/2 -> R3

  1  -1   0   7
  0   1  -1  -3
  0   0   1   0

R3 + R2 -> R2

  1  -1   0   7
  0   1   0  -3
  0   0   1   0

R2 + R1 -> R1

  1   0   0   4
  0   1   0  -3
  0   0   1   0


x = 4; y = -3; z = 0

</pre>
John
*[tex \LARGE e^{i\pi}\ +\ 1\ =\ 0]
<font face="Math1" size="+2">Egw to Beta kai to Sigma</font>
My calculator said it, I believe it, that settles it
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