Question 1067210
Solve using matrices.
x – 3y + z = 10 
x + y – 3z = -10
-3x – y + z = 2
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It is a matrix.  Matrix is not a method.
You can use determinants, or Gauss-Jordan, for example.
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<pre>
| 1  -3   1   10|
| 1   1  -3  -10|
|-3  -1   1    2|

</pre>
Using Determinants:
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Det = 1*(1-3) -(-3)*(1-9) + 1*(-1+3) = -2-24+2 = -24
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x*Det = -3*(-6+10) - 1*(2-10) + 10*(1-3) = -12+8-20 = -24 --> x = 1
-y*Det = 1*(-6+10) - 1*(2-30) + 10*(1-9) = 4+28-80 = -48 --> y = -2
z*det = 1*(2-10) - (-3)*(2-30) + 10*(-1+3) = -8-84+20 = -72 --> z = 3
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