1
Infinitely many.
Infinitely many.
one
Anything that contains the line must contain every point on the line, so "a point on the line" doesn't give us any more information. You're just asking how many planes can contain the line. Now imagine setting a wood panel down on a tight-rope. How many different ways can it set there before it falls off ? A lot, right ? An infinite number of planes can all contain your line. (And all of its points.)
four.
3
1
1
There is only one such plane.
1
Infinitely many.
Infinitely many.
No, perpendicular planes intercept at only one point. Parallel planes do not intersect at all.
one
None.
exactly 1