Lesson 2.4
Algebra 1: S.25, S.26
Video: Slopes of Parallel Lines
Video: What Lines are Parallel (when they are not in Slope-Intercept Form)
Video: Slopes of Perpendicular Lines
Practice: Deciding if Lines are Parallel or Perpendicular
Video: Writing Equations of Perpendicular Lines (Example 1)
Video: Writing Equations of Perpendicular Lines (Example 2)
Practice: Writing Equations of Parallel and Perpendicular Lines