Parallel and Perpendicular Lines

Front

What are parallel lines?

Back

Parallel lines are lines in a plane that never meet or intersect. They have the same slope.

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What are perpendicular lines?

Back

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

Front

What is the slope of a line in slope-intercept form?

Back

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

Back

The slope of the line is 3.

Front

Back

The slope of the line is -rac{1}{2}.

Front

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

Back

The slope of a line perpendicular to line A is -rac{1}{2}.

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