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( 2x - y = 1
( x = - 2y - 2
( 2*(- 2y - 2) - y = 1
( x = - 2y - 2
( - 4y - 4 - y = 1
( x = - 2y - 2
( - 4y - y = 1 + 4
( x = - 2y - 2
( - 5y = 5 /:(- 5)
( x = - 2y - 2
( y = - 1
( x = - 2*(-1) - 2
( y = - 1
( x = 2 - 2
( y = - 1
( x = 0
( y = - 1
2x-y=1
2x+4y=-4
2x-y=1
5y=-5/:5
y=-1
2x-y=1
2x+1=1
2x=1-1
x=0
odp: x=0, y=-1
2x-y=1
x=-2-2y
2(-2-2y)-y=1
-4-4y-y=1
-5y=5
y=-1
x=-2-2*(-1)
x=-2+2
x=0