Algebra 1 Lesson #18 How to Determine if Two Lines are Parallel or Perpendicular

In this lesson, we will explore the concept of parallel lines, which will never intersect and perpendicular lines which will intersect at a 90 degree angle. We will use the slope-intercept form of a line to quickly determine if the lines are parallel if they have the same slope or perpendicular if the product of the slopes is -1.