Given: Equation of plane is

Formula Used: Equation of a plane is where is the unit vector normal to the plane, represents a point on the plane and is the distance of the plane from the origin.

Explanation:

The equation of the given plane is … (1)

Now,

= 7

is a unit vector.

(1) can be rewritten as

which is of the form

Perpendicular vector from the origin to the plane is

So, direction cosines of the vector perpendicular from the origin to the plane is