Parallel and Perpendicular

Front

What is the slope of two parallel lines?

Back

The slope of two parallel lines is the same.

Front

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

Back

The slope of a line that is perpendicular to m = 3 is -1/3.

Front

What do two perpendicular lines have in common regarding their slopes?

Back

Two perpendicular lines have slopes that are opposite reciprocals.

Front

If two lines have slopes m = 1/5 and m = 1/5, what is their relationship?

Back

The lines are parallel.

Front

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

Back

The product of their slopes is -1.

Front

If a line has a slope of 0, what type of line is it?

Back

It is a horizontal line.

Front

What type of line has an undefined slope?

Back

A vertical line.

Front

If two lines are parallel, what can be said about their angles?

Back

They will never intersect and have the same angle with the x-axis.

Front

How can you determine if two lines are perpendicular using their slopes?

Back

If the slopes are opposite reciprocals, the lines are perpendicular.

Front

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

Back

The slope of the perpendicular line is 1/2.