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X-3y=6
X=3y+6
Subtitus1
3x+5y=4
3(3y+6)+5y=4
9y+18+5y=4
14y+18=4
14y=4-18
Y=-14/14
Y=-1
Subtitusi2
X-3y=6
X-3(-1)=6
X+3=6
X=6-3
X=3
2x+3y=...
2(3)+3(-1)=...
6-3=3
2x+3y=3