These are very basic questions.
. . Exactly where is your difficulty?
The direction vectors of the lines are: .a) Determine whether the lines: .
are orthogonal, parallel or neither.
Since is not a scalar multiple of , they are not parallel.
We find that: .
Do the coordinates satisfy the equation? . . . Plug them in!b) Determine whether the line . .contains the point (6,-3,8)
We have a point and the direction vectorc) Find an equation of the line containing the given point (5,3,4)
and parallel to the vector: .
. . . Well?