Parallel and Perpendicular Lines

Front

What is the definition of parallel lines?

Back

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

Front

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

Back

Front

If two lines have slopes m1 and m2, what condition must be met for them to be perpendicular?

Back

Front

Back

Front

Back

These lines are neither parallel nor perpendicular.

Front

Back

Front

Back

Front

If two lines have the same slope, what can we say about their relationship?

Back

If two lines have the same slope, they are parallel.

Front

Back