Parallel.
OR
Lines that are in different planes and never intersect could be skew lines. Think about it this way: If the lines are going in different directions (e.g., one's vertical and the other is slanted or horizontal), but they're never going to intersect, then they're skew, not parallel.
Picture a cardboard box: pick two edges of the box. These edges either intersect (meet at a corner), are parallel (the edges that are "traveling" in the same direction), or are skew (don't meet either of the previous two conditions--pick a horizontal edge and a vertical edge that don't touch each other).
parallel lines If they are not on the same plane and never intersect they are skew
Parallel lines. they never intersect and lie on the same plane.parallel lines
No, if the lines were in the same plane they would be parallel and never intersect
parallel lines
They are parallel lines
parallel lines If they are not on the same plane and never intersect they are skew
Two lines that are in the same plane and never intersect are called "Parallel," meaning that they are lines with the same slope, but not y-intersect.
Parallel lines. they never intersect and lie on the same plane.parallel lines
Lines in the same plane that do not intersect Lines in the same plane that do not intersect Lines in the same plane that do not intersect Lines in the same plane that do not intersect
Parallel lines. they never intersect and lie on the same plane.parallel lines
They are parallel lines
Parallel lines
No, if the lines were in the same plane they would be parallel and never intersect
parallel lines ( I think)
parallel lines
They are parallel lines
parallel