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1. a)![left { {{2x-y=3} atop {x+y=6}} right. left { {{2x-y=3} atop {x+y=6}} right.](https://tex.z-dn.net/?f=+left+%7B+%7B%7B2x-y%3D3%7D+atop+%7Bx%2By%3D6%7D%7D+right.+)
![left { {{2(6-y)-y=3} atop {x=6-y}} right. left { {{2(6-y)-y=3} atop {x=6-y}} right.](https://tex.z-dn.net/?f=+left+%7B+%7B%7B2%286-y%29-y%3D3%7D+atop+%7Bx%3D6-y%7D%7D+right.++)
![left { {{12-2y-y=3} atop {x=6-y}} right. left { {{12-2y-y=3} atop {x=6-y}} right.](https://tex.z-dn.net/?f=+left+%7B+%7B%7B12-2y-y%3D3%7D+atop+%7Bx%3D6-y%7D%7D+right.+)
![left { {{3y=9} atop {x=6-y}} right. left { {{3y=9} atop {x=6-y}} right.](https://tex.z-dn.net/?f=+left+%7B+%7B%7B3y%3D9%7D+atop+%7Bx%3D6-y%7D%7D+right.+)
}}
6) x^2+2y^2 =5 2+y^2+2y^2=5 3y^2=3 y^2=1 y1=1 y2=-1
y^2-x^2=-2 x^2=2+y^2 x^2=2+1 x1=√3 x2 = -√3
6) x^2+2y^2 =5 2+y^2+2y^2=5 3y^2=3 y^2=1 y1=1 y2=-1
y^2-x^2=-2 x^2=2+y^2 x^2=2+1 x1=√3 x2 = -√3
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