x2+y2−2x+6y+4=0x^{2}+y^{2}-2 x+6 y+4=0x2+y2−2x+6y+4=0
x2+y2−4x+6y+5=0x^{2}+y^{2}-4 x+6 y+5=0x2+y2−4x+6y+5=0
x2+y2−2x+6y+1=0)x^{2}+y^{2}-2 x+6 y+1=0)x2+y2−2x+6y+1=0)
2x2+2y2−2x+6y+3=02 x^{2}+2 y^{2}-2 x+6 y+3=02x2+2y2−2x+6y+3=0