The solution of mathematical problems is known as two parallel straight lines ab and plane (Afa). Line a intersects Afa. Prove: Does the straight line B intersect the plane (Afa)?
Assuming that b is parallel to Afa or coincides with Afa, then A is parallel to Afa and intersects with straight lines A and Afa. If B is parallel to Afa, there is a straight line in Afa, but since A is parallel to B and A is parallel to the straight line, A is parallel to Afa or intersects with straight lines A and Afa in Afa, so the assumption is not valid.