If the slopes of two lines are unequal, they will cross somewhere, so the distance between them depends on x, and isn't really defined.
If the slopes are equal, they are parallel, so they don't cross. So two lines are far apart if they have the same slope and a large difference in their x or y intercepts.
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It depends on what kind of line you are dealing with.If you have the lines on paper...If they do not intersect, they are parallel.If they do, measure the angle. If it is 90° then they are perpendicular.If you have the equations of the lines. If the slopes are the same, but they have a different y-intercept, they are parallel.if the slopes are inverse reciprocals of each other (i.e. 2 and -.5) then they are perpendicular.■
Relief
Could be italic or possibly copperplate.
lines that are beside each other and never meet
Perpendicular and parallel lines are two examples.