(1)
Transforming (1) into Cartesian form, we have
ˆ
ˆ
ˆ
ˆ
ˆ
ˆ
[( –5)
(
2)
(
4) ] (2
3
)
0
x
i
y
j
z
k
i
j
k
+
−
+
+
⋅
+
−
=
or
2(
5) 3(
2) 1(
4) 0
x
y
z
− + − − + =
i e 2x + 3y – z = 20
which is the cartesian equation of the plane 11