GCE Maths

With respect to an origin O, the pts. A and B have the following position vectors

OA=2i+2j+k OB=i+4j+3k

The line has vector equation

r=4i-2j+2k+s(i+2j+k)

what is s?

is this "line" a sum of the vectors OA;OB? if so is the point of the exercise to find s?

I. Prove that the line l does not intersect the line through A and B

If a and b are vectors it does not matter where on the cordinate system you place them. Not sure what you mean here...?

II. Find the equation of the plane containing l

what is this? and the point A giving your answer in the form ax+by+cz=d