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2x-y-z=3
x+y-z=5
z=6-x-y
2x-y-(6-x-y)=3
x+y-(6-x-y)=5
z=6-x-y
2x-y-6+x+y=3
x+y-6+x+y=5
z=6-x-y
3x=9 /÷3
2x+2y=11
x=3
z=6-3-y
2×3+2y=11
x=3
z=3-y
2y=5/÷2
x=3
y=2,5
z=0,5
2x-y-z=3
x+y-z=5
dwa pierwsze równania dodajemy do siebie
3x=9
x=3
drugie i trzecie dodajemy
3x-2z=8
9-2z=8
-2z=-1
z=1/2
xi y podstawiamy np. do pierwszego równania
3+y+1/2=6
y=2½