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2x-6y=25 /*(-1)
2x+y=11
-2x+6y=-25 dodajemy stronami
--------------- +
7y=-14 /: 7
y = -2
2x-2=11
2x=11+2
x=13/2
x=6,5 y= -2
2x-6y=25
2x=11-y
2x-6y=25
2x=11-y
11-y-6y=25
2x=11-y
-7y=14/:(-7)
2x=11-y
y=-2
2x=11-(-2)
2x=13/:2
x=6,5