Question
The center of a circle that is orthogonal to the circles described by $x^2 + y^2 + 6x - 1 = 0$ and $x^2 + y^2 + x + y - 3 = 0$ is ........
The center of a circle that is orthogonal to the circles described by $x^2 + y^2 + 6x - 1 = 0$ and $x^2 + y^2 + x + y - 3 = 0$ is ........