<PRE><B>Question 275319</B>

2x + 3y - z = -8
x - y - z = -2
-4x + 3y + z = 6

(1 - 2) x + 4y = -6
(1 + 3)-2x +6y = -2
2x + 8y = -12 
14y = -14
y = -1

2x - 3 - z = -8
x + 1 - z = -2
-4x -3 +z = 6

2x - z = -5
x - z = -3
-4x + z = 9

4x - 2z = -10
-z = -1
z = 1

2x -3 -1 = -8
2x = -4
x = -2
so x= -2, y = -1, z = 1

Check in 2
-2 + 1 - 1 = -2  OK

 

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