Use their slopes to determine if two lines are parallel or perpendicular.
This concept introduces parallel and perpendicular lines and their relationship with slope.
How to determine if a set of lines are parallel, given their equations, as explained by Khan Academy.
How to find the equation of a line, given one of its points and that it is perpendicular to another line, as explained by Khan Academy.
Determining Parallel v. Perpendicular Given Graphs of Two Lines
Determining Parallel v. Perpendicular Given Two Linear Equations
Writing Equations of Parallel or Perpendicular Lines Given a Word Problem
Writing and Solving Equations of Parallel or Perpendicular Lines Given a Word Problem
Practice Comparing Equations of Parallel and Perpendicular Lines questions
Sort out a jumble of key words into categories using the Card Sort strategy. This activity may help you to develop skills for remembering key words and concepts.
Drag around a pair of perpendicular lines to see how their slopes change.