e 5x – 4y – z = 7
Example 28 Find the distance between the point P(6, 5, 9) and the plane determined
by the points A (3, – 1, 2), B (5, 2, 4) and C(– 1, – 1, 6) Solution Let A, B, C be the three points in the plane D is the foot of the perpendicular
drawn from a point P to the plane