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.

Front

What are perpendicular lines?

Back

Perpendicular lines are lines that intersect at a right angle (90 degrees).

Front

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

Back

They are parallel.

Front

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

Back

The slope of the perpendicular line is -1/3.

Front

What is the relationship between the slopes of two perpendicular lines?

Back

The slopes of two perpendicular lines are opposite reciprocals.

Front

If the slopes of two lines are identical, what can we conclude?

Back

The lines are parallel.

Front

What is the slope of a line that is perpendicular to a line with a slope of -2?

Back

The slope of the perpendicular line is 1/2.

Front

How can you determine if two lines are neither parallel nor perpendicular?

Back

If their slopes are different and not opposite reciprocals, they are neither.

Front

What is the slope of the line represented by the equation y = 4x + 1?

Back

The slope is 4.

Front

If two lines are parallel, what can be said about their y-intercepts?

Back

Their y-intercepts can be different.