15 Find the equation of the plane passing through the line of intersection of the
planes 
ˆ
ˆ
ˆ
(
)
1
r
i
j
k
⋅
+
+
=
r
and 
ˆ
ˆ
ˆ
(2
3
)
4
0
r
i
j
k
⋅
+
−
+
=
r
 and parallel to x-axis 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