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 16) Hence, the plane meets x, y and z-axes at (a, 0, 0),
(0, b, 0), (0, 0, c), respectively