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parrallel lines run side by side and do not touch intersecting cross each other
Intersecting cross each other whereas perpendicular lines cross at right angles.
perpendicular cross parallel do not
There is no relationship between the slopes of parallel or perpendicular lines and their y-intercepts.
More info needed. Are the 2 lines parallel, perpendicular, or? are the angles that you are interested in on opposite sides of the intersecting line or the same side. The intersecting line is called a transversal. If the original lines are parallel, angles between the 2 lines on opposite sides of the transversal are called alternate interior angles, etc.