The point A(1;1;1) and the vector v->=(1;2;3).
Find the point B on the xy plane provided that v-> is collinear with AB->
My half-done solution:
2x-y=1 (the result of cross product, I don't know the exact word in english)
So, what should be the x and y that they would be collinear. Maybe this approaching is wrong because of two unknown values.
Don't know what's next move.