For the first one, you must find the normal vector of the plane.
Observe that . So the plane looked for is .
For the second one, observe that the line can be written as so the directional vector is . From Linear Algebra, you know that the plane given belongs to . Also, observe that what means the directional vector can be contained in a parallel plane to the given one. Finally, if you choose a positional vector (so the line can really be contained and not just be parallel to it) you get .