6 4  Intercept form of the equation of a plane
In this section, we shall deduce the equation of a plane in terms of the intercepts made
by the plane on the coordinate axes Let the equation of the plane be
Ax + By + Cz + D = 0  (D ≠ 0) (1)
Let the plane make intercepts a, b, c on x, y and z axes, respectively  (Fig 11