lines & planes

Find parametric equations and symmetric equations for the line through P0 and perpendicular to both given vectors. (P0 corresponds to t = 0.) P0 = (4, 3, 0) i + j and j + k Not exactly sure what to do, how do I find what is perpendicular to both vectors?

Find an equation of the plane through the point and perpendicular to the given vector. (7, 1, 5) ‹-3, 1, 2› I think I need the normal vector, but how do I find it? And then what do I do? Thank you.