a Find symmetric equations for the line that passes through the point 5 1 7 and is parallel to the vector 1 3 4 X 5 x 1 2 7 y 3 4 O x 5 3 y 1 4 z 7 0X 5 y 1 2 7 4 Ox 5 Y 7 3 O x 5 3 y 1 4 2 7 b Find the points in which the required line in part a intersects the coordinate planes point of intersection with xy plane point of intersection with yz plane point of intersection with xz plane