6.5

Parallel lines do not intersect. They have the same sl ope. For example: y=1/2x-2 & y=1/2x-2 are parallel because they have the same slope of 1/2. 

A train track is an example of parallel lines in the real world.

Here is a [|video] explaining about parallel lines. Perpendicular intersect to form right angles. They have an opposite reciprocal slopes. For example: y=1/2x+4 & y=2x+5 have opposite reciprocals of 1/2 and -2/1. The lines are perpendicular. Here is a website that will teach you [|more:] CREDIT TO GINA LACERVA