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Verified answer
2x + y - z = 2x + 2y + 3z = 1
3x - y + 2z = 3
2x + y - z = 2
x + 2y + 3z = 1
2x + y - z = 2
2x + 4y + 6z = 2
_____________ _
-3y - 7z = 0
3x + 6y + 9z = 3
3x - y + 2z = 3
_____________ _
7y + 7z = 0
-3y - 7z = 0
7y + 7z = 0
__________ +
4y = 0
y = 0
-3y - 7z = 0
-3(0) - 7z = 0
0 - 7z = 0
z = 0
2x + y - z = 2
2x + 0 - 0 = 2
2x = 2
x = 1
x, y, z = 1, 0, 0