The lines have to intersect because lines go on forever and if then are not parallel then they will collide. Even if they are not parallel by one degree they will still intersect.
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Parallel lines do not intersect.
Two lines cross or intersect at a point.
When two lines intersect they form an axes.
Skew lines never intersect. If two lines intersect, then they are known as "intersecting lines", not skew lines.