4.3 Parallel vs. Perpendicular Lines

Front

What is the slope of a line that is perpendicular to a line with a slope of 5?

Back

The slope of a line that is perpendicular to a line with a slope of 5 is -1/5.

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What are the slopes of parallel lines?

Back

The slopes of parallel lines are the same.

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What are the slopes of perpendicular lines?

Back

The slopes of perpendicular lines are negative reciprocals.

Front

If a line has a slope of 3/2, what is the slope of a line perpendicular to it?

Back

The slope of a line perpendicular to a line with a slope of 3/2 is -2/3.

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Back

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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.

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