A1 Alg1 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.

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What are perpendicular lines?

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

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How do you determine if two lines are parallel?

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Two lines are parallel if they have the same slope.

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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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What is the slope-intercept form of a line?

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Back

The slope is 0, as it is a horizontal line.