Parallel and Perpendicular Lines

Front

What are parallel lines?

Back

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

Front

What are perpendicular lines?

Back

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

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

Back

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

Front

Back

The slope of the line is 2.

Front

Back

Front

Back

These lines are neither parallel nor perpendicular.

Front

Back

Front

Back

Front

Back

The lines are perpendicular.

Front

What is the slope of a line that is perpendicular to a line with slope 3?

Back