3x2+y2=10x3 x^{2}+y^{2}=10 x3x2+y2=10x
4x2+y2=x4 x^{2}+y^{2}=x4x2+y2=x
x2+3y2=7xx^{2}+3 y^{2}=7 xx2+3y2=7x
3x2+3y2=25x3 x^{2}+3 y^{2}=25 x3x2+3y2=25x