I have multiple questions of that kind, the first one was
Describe the line from point A(1,2,3) to point B(2,-1,1)
My answer is : V = OA + OB , right ?
Should I do something like V = x1A+x1B , AB = (1+2,2-1,3+1), AB = (3,1,4) ?
Then I have to describe the parallelogram at the origin $$A(1,2,3)$$ made the 2 vectors $$[2,-1,1] and [1,1,1]$$
I ended up with $$X = Ov1 + Ov2 , so X = (1,2,3)[2,-1,1] , (1,2,3)[1,1,1]$$
Then I'll have to describe the form that use four points $$A(1,2,3), B(-1,2,0) C(1,0,1) D(0,1,1)$$
Yeah... I'm confuse.