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x+y-z=0
---------------(+)
2x + 4y = 6 ... pers 1
x+y-z=0
x-y-z=2
------------(-)
2y=2
y = 1
2x + 4y = 6
2x + 4.1 = 6
2x = 6 - 4 = 2
x = 2 : 2 = 1
x+y-z = 0
1+1-z = 0
-z = 0 - 2
z = 2