1)x²-2xy+2y²+x-6y+6=0 x=3 3²-2*3y+2y²+3-6y+6=0 9-6y+2y²-6y+9=0 2y²-12y+18=0|:2 y²-6y+9=0 (y-3)²=0 y=3 2)2xy=9 x=3 2*3*y=9 6y=9|:6 y=1,5 3)3x-2y+4=0 x=3 3*3-2y+4=0 9-2y+4=0 -2y=-13|:(-2) y=6,5 4)x²-3x-y+2=0 x=3 3²-3*3-y+2=0 9-9-y+2=0 -y=-2 y=2