8 The equation of a curve is \(y = 5 - \frac { 8 } { x }\).
- Show that the equation of the normal to the curve at the point \(P ( 2,1 )\) is \(2 y + x = 4\).
This normal meets the curve again at the point \(Q\).
- Find the coordinates of \(Q\).
- Find the length of \(P Q\).