Question

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Answer 1

2x+y-8z=-3

x+y-2z=0

x+2y+z=6

x=2z-y

2z-y+2y+z=6

3z+y=6

y=6-3z

2(2z-(6-3z))+6-3z-8z=-3

2(2z-6+3z)+6-11z=-3

2(5z-6)+6-11z=-3

10z-12-11z=-3

-z=9

z=-9

y=6-3.-9

y=6+27

y=33

x=2.-9+33

x=-18+33

x=15

x=15,y=33,z=-9