a. The equation of the line with point (3,−6,8) and parallel to the vector (−1, 2
1
​
, 4
3
​
⟩. b. The equation of the plane containing the points (3,1,3), (4,0,−2), and (11,−5,12) c. The equation of the plane containing the point (2,3,7) and perpendicular to the line with direction vector ⟨7,5,2⟩.