a couple True or False questions

True or False: [ marks] 6. The direction vector of a line is an indicator of its slope. 7. A plane written in scalar form cannot be written in vector form. 8. In three-space there are no more than 2 possibilities for the intersection of two Lines. 9. If the cross product of the direction vector of a line and the normal of a plane is not equal to zero, then the intersections of the line and the plane is a point. 10. Lines intersect in a point in two-space but do not intersect in three-space 11. .Any three non-collinear points in space will define a unique plane 12. The planes will always intersect at a point if their normals are not coplanar. 13 A normal vector to a line is always parallel to that line. 14. Two planes are perpendicular if their normals are perpendicular. 15. A line will always intersect with a plane