A straight line may be in one of the following positions:

1. Line parallel to both H.P. and V.P.
2. Line perpendicular to H.P. (and parallel to V.P.)
3. Line perpendicular to V.P. (and parallel to H.P.)
4. Line inclined to H.P. and parallel to V.P.
5. Line inclined to V.P. and parallel to H.P.
6. Line situated in H.P.
7. Line situated in V.P.
8. Line situated in both H.P. and V.P. (i.e. on the reference line, XY).
9. Line inclined to both the reference planes.

LINE PARALLEL TO BOTH H.P. AND V.P.

LINE PERPENDICULAR TO H.P.

LINE PERPENDICULAR TO V.P.

LINE INCLINED TO H.P. AND PARALLEL TO V.P.

LINE INCLINED TO V.P. AND PARALLEL TO H.P.