Equations of Parallel and Perpendicular Lines

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Front

If two lines have slopes m_1 and m_2, what condition must be met for the lines to be perpendicular?

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Front

What is the definition of parallel lines in terms of slope?

Back

Parallel lines have the same slope.

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What is the definition of perpendicular lines in terms of slope?

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Perpendicular lines have slopes that are negative reciprocals of each other.

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If a line has a slope of 0, what type of line is it?

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It is a horizontal line.

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If a line has an undefined slope, what type of line is it?

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It is a vertical line.

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The slope is -3.