9. Determine the value of 'p'

If the area of the quadrilateral joining the vertices  \(A (-10, p)\), \(B (-6, -5)\), \(C (7, -4)\) and \(D (1, 9)\) taken in order is 161 square units, then determine the value of \(p\).

 

Answer:

 

The value of \(p\) is .