3 The point \(A\) has coordinates \(( 3,1 )\) and the point \(B\) has coordinates \(( - 21,11 )\). The point \(C\) is the mid-point of \(A B\).
- Find the equation of the line through \(A\) that is perpendicular to \(y = 2 x - 7\).
- Find the distance \(A C\).