book Maths Puzzle Numerical Ability

Find a vector x with ||x||=2 that has the same direction as the vector defined by the points A(3,2,1) and B(1,-1,0).
The opposite direction?

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I need help,here's an example:

Rewrite the equation so that y is a function of x.

-4x + y = 9
-3y + 18x = 12

Please keep it simple I'm only 12. Thanks, Tony The lines satsifying the equations x + dy=3 and 3y +ax=2 are perpendicular to each other find a