8. The circle \(C\), with centre at the point \(A\), has equation \(x ^ { 2 } + y ^ { 2 } - 10 x + 9 = 0\).
Find
- the coordinates of \(A\),
- the radius of \(C\),
- the coordinates of the points at which \(C\) crosses the \(x\)-axis.
Given that the line \(l\) with gradient \(\frac { 7 } { 2 }\) is a tangent to \(C\), and that \(l\) touches \(C\) at the point \(T\),
- find an equation of the line which passes through \(A\) and \(T\).