two lines intersect at a single point in a 2D space assuming they are not parallel. in 3D space they can intersect again at a single point, or an infinite amount of points.
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Perpendicular lines intersect at one point only.
Skew lines
This is true. If three straight lines are drawn, they can only intersect at two points. That is, each line will only intersect with another once.
They are parallel lines
parralel lines