16 If O be the origin and the coordinates of P be (1, 2, – 3), then find the equation of
the plane passing through P and perpendicular to OP 17 Find the equation of the plane which contains the line of intersection of the planes
ˆ
ˆ
ˆ
(
2
3 )
4
0
r
i
j
k
⋅
+
+
−
=
r
,
ˆ
ˆ
ˆ
(2
)
5
0
r
i
j
k
⋅
+
−
+
=
r
and which is perpendicular to the
plane 
ˆ
ˆ
ˆ
(5
3
6 )
8
0
r
i
j
k
⋅
+
−
+
=
r