2x+y+3z=5 (1)
3x-2y-z=6 (2)
4x-3y+2z=4 (3)
(1)×2+(2) 7x+5z=16 (4)
(2)×3+(3) 10x+11z=19 (5)
相减 3x+6z=3 x+2z=1 x=1-2z
代入上式(5) 7-14z+5z=16 9z=-9 z=-1
x=3
y=2
2x+y+3z=5 3x-2y-z=6 4x-3y+2z=4
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