7 The plane \(\Pi\) has equation \(3 x - 5 y + z = 9\).
- Show that \(\Pi\) contains
- the point (4,1,2)
and - the vector \(\left( \begin{array} { l } 1
1
2 \end{array} \right)\). - Determine the equation of a plane which is perpendicular to \(\Pi\) and which passes through ( \(4,1,2\) ).