Is the line x=1-2t,y=2+5t,z=-3t parallel to the plane 2x+y-z=8? I've used the approach of finding the dot product of the directional vector of the line and the vector normal to the plane in this question. The line is not parallel to the plane. But I'm not too sure if my working is correct. Can anyone please check my working? It's here: https://skydrive.live.com/?cid=6b04...751C72E14AD&id=6B041751C72E14AD!160&sc=photos Thank you.