Slope:-
Equation in point slope form
Option A
If you have one per box you got 20 broken in all.
Take the given vector by itself, 
. Scaling the vector by a scalar 
will stretch the vector. Any real number can take the place of ; when we consider all possible choices, we see that 
traces out an infinite line through the origin and the point (2, 1, -1). (Left)
Next, treat point P(2, 1, -3) as a vector, 
. (Upper right) By adding 
to , we get a new vector that, as we change the value of , traces out the line through point P which also happens to be parallel to 
. (Lower right)
So the equation of this line in parametric form is
or in ijk notation,
It is D-576 because if you divide 576 ÷12 you get 48, but also you can multiply 48×12 which you get 576.So the answer is 576:)
