2 A circle with centre \(C\) has equation \(x ^ { 2 } + y ^ { 2 } - 6 x + 4 y + 4 = 0\).
- Find
- the coordinates of \(C\),
- the radius of the circle.
- Determine the set of values of \(k\) for which the line \(y = k x - 3\) does not intersect or touch the circle.