If the straight line x-x_0/l=y-y_0/m=z-z_0/n is parallel to the plane ax + by + cz + d = 0, then which one of the follow
Applying the basic concept, using formula we get al + bm + cn = 0. Calculation gives this directly, check steps: apply rule, substitute values, simplify to get al + bm + cn = 0.
Ref: NCERT Mathematics Class XI — Coordinate Geometry
