Equations of Parallel and Perpendicular Lines

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What are parallel lines?

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Parallel lines are lines in a plane that never meet. They have the same slope but different y-intercepts.

Front

What are perpendicular lines?

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Perpendicular lines are lines that intersect at a right angle (90 degrees). The slopes of two perpendicular lines are negative reciprocals of each other.

Front

How do you determine if two lines are parallel?

Back

Two lines are parallel if they have the same slope.

Front

How do you determine if two lines are perpendicular?

Back

Two lines are perpendicular if the product of their slopes is -1.

Front

What is the slope-intercept form of a line?

Back

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Front

Back

The slope of the line is -4.

Front

Back

They are parallel.

Front

If a line has a slope of 3, what is the slope of a line perpendicular to it?

Back