Notes and Practice
CRM 1.1 - Lesson 11
Parallel and Perpendicular Lines
Finding Slope of a Line
Notes:
Slope (​m)​ Formula:
A. What is the slope of
line ​b?
m = rise/run =
Slope-Intercept Form:
B. What is the slope of
line ​d?
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Characteristics of Parallel and Perpendicular Lines
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Parallel Lines ​are two lines in a plane that do not ever _______________.
When two lines are parallel, their slopes are the _____________.
Any two horizontal lines are parallel and any two vertical lines are parallel.
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Perpendicular Lines ​are two lines in a plane that intersect each other at
_______________ _______________ (90°).
When two lines are perpendicular, their slopes are _____________
_____________.
Any horizontal line is perpendicular to any vertical line.
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Checking For Parallel & Perpendicular Lines: Your Turn
Are lines l1 and l2 parallel? Explain.
Are lines l1 and l2 perpendicular? Explain.
Notes and Practice
CRM 1.1 - Lesson 11
Parallel and Perpendicular Lines
Determine the slope of the line that meets the following criteria.
Independent Practice
Determine if the lines in each graph are parallel, perpendicular or neither? Justify your answer.
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Notes and Practice
CRM 1.1 - Lesson 11
Rewrite each equation in slope-intercept form, if necessary. Then determine
whether the lines are parallel, perpendicular or neither.
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