# Perpendicular and Parallel Lines

Provide the definitions of parallel and perpendicular lines, as well as the relationships between their slopes. Two examples explain the process of finding the equation of either a perpendicular or parallel line to another line through a given point. The graphed lines help visually demonstrate their relationship to each other.

CCSS: Designed

##### Instructional Ideas

• Give class members several pairs of lines and have them determine whether the pairs are parallel, perpendicular, or neither
• Provide the graph of line that makes one side of a rectangle and have pupils determine the equations for the other three sides
##### Classroom Considerations

• The resource does not cover the proof portion of the standard, but it does address use of the slopes of parallel and perpendicular lines
• This resource is only available on an unencrypted HTTP website. It should be fine for general use, but don’t use it to share any personally identifiable information
##### Pros

• Explanations use color coding to help highlight where values are substituted
• Examples go through each step in converting from point-slope form to slope-intercept form

• None