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2x-y+z=2 X 3 >= 6x-3y+3z=6
______________ -
7y +3z = 6 4)
3x+2y+3z=6
3x+2y-z=4
___________ -
2z = 2
z = 1
z = 1 disubstitusi ke 4)
7y+3.1=6
7y=6-3
y=3/7
z=1, y=3/7 disubstitusi k 1/2/3
3x+2.3/7-1=4
3x-1/7=4
3x=4+1/7
x=29/7:3
x=29/21