Hi, I have this equation: x^2+12x+y^2-6y+29=0 and need to find it's centre and radius, also the coordinates of any points at which the circle intersects the line y = x+13. I have had a few stabs at finding the centre and radius but think I go wrong at one partcular point so could someone perhaps explain the method so I can clarify in my mind the correct precedure. Thanks.