Question

1/10 what must be true for two lines to be considered parallel? they must be on the same plane. 1 they must have the same slope. 2 they must have different slopes. 3 they must intersect at a right angle. 4

Explanation:

Parallel lines are defined as lines in a plane that do not intersect. For two lines to be parallel, they must lie on the same plane (coplanar) and have the same slope. If they had different slopes, they would intersect at some point (unless they are skew, but skew lines are not coplanar). Lines that intersect at a right - angle are perpendicular, not parallel.

Answer:

1. They must be on the same plane.
2. They must have the same slope.