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We will learn that 2 lines are parallel if and only if the slopes are equal to each other, and 2 lines are perpendicular if and only if the slopes of one is the negative inverse of the slope of the other.

Previous video in this series on YouTube: https://youtu.be/upF8zQkX9pg
Title: Geometry - Ch. 4: Lines and Angles (41 of TBD) Find the Slopes of Each Line

Next video in this series on YouTube: https://youtu.be/-3k1pVUiAcA
Title: Geometry - Ch. 4: Lines and Angles (43 of TBD) Aare Lines Parallel and Perpendicular Lines? Examples