Graphs: Parallel lines

Parallel lines must always have the same slope. Learners use this bit of information to extend their equation writing skills. A video lesson explains how to write the equation of a line parallel to a given line and through a given point. The video instructor then demonstrates the calculations using slope-intercept form.

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CCSS: Adaptable
Instructional Ideas

  • Have pupils begin by completing a discovery activity to learn that the slopes of parallel lines are equal
  • Extend the lesson to include perpendicular lines for more advanced pupils
Classroom Considerations

  • Assumes students know how to write the equation of a line given a point and slope
Pros

  • Relates the equation of the lines to their graph
  • Uses visuals to reinforce the concepts
Cons

  • None