Sagot :
A line contains at least two points (Postulate 1). If two lines intersect, then exactly one plane contains both lines (Theorem 3). If a point lies outside a line, then exactly one plane contains both the line and the point (Theorem 2)
Answer:
Through any two points, there is exactly one line. A plane contains at least three noncollinear points. If two lines intersect, then their intersection is exactly one point. Answer:Always; if two points lie in a plane, then the entire line containing those points lies in the plane.