Question 449181
 Can someone please show me step by step how to solve this problem using matrices? I’m missing something somewhere, Thanx.
x – y + 4z = 6
2x + z = 1
x +5y + z = -9

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Form the matrix:
1..-1...4
2...0...1
1...5...1
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Find it's inverse:
The foll0wing is multiplied by 1/36
-5....21....-1
-1....-3.....7
30....-6.....2
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Multiply the inverse times the 
column matrix [6....1.....-9] to get
x = 0
y = -2
z = 1
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Cheers,
Stan H.
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