x2+y2−6x−16=0x^{2}+y^{2}-6 x-16=0x2+y2−6x−16=0
x2+y2−6y−16=0x^{2}+y^{2}-6 y-16=0x2+y2−6y−16=0
x2+y2−6x−6y+16=0x^{2}+y^{2}-6 x-6 y+16=0x2+y2−6x−6y+16=0
x2+y2+6x−16=0x^{2}+y^{2}+6 x-16=0x2+y2+6x−16=0