Consider a circle whose equation is x y 4x 6y 36 0 Which statements are true Check all that apply To begin converting the equation to standard form subtract 36 from both sides To complete the square for the x terms add 4 to both sides The center of the circle is at 2 3 O The center of the circle is at 4 6 O The radius of the circle is 6 units O The radius of the circle is 49 units