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2A-B-3C=-1 (1)
2A-B+C=-9 (2)
A+2B-4C=17 (3)
(1)-(2)
-4C=8
C=-2
2A-B=-7 (4)
A+2B=9 (5)
(5)×2 2A+4B=18 (5)'
(4)-(5)'
-5B=-25 B=5
subtitusi ke (5)
A+10=9
A=1
maka A=1 B=5 C=-2
jadi x=1, y=1/5, z=-1/2