Parallel and Perpendicular Lines

Front

What are parallel lines?

Back

Lines that never intersect and have the same slope.

Front

What is the slope of parallel lines?

Back

The slope is the same for both lines.

Front

What is the slope of perpendicular lines?

Back

The slopes are opposite reciprocals.

Front

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

Back

The slope will be -1/m.

Front

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

Back

1/3.

Front

What is the slope of a line that is parallel to a line with a slope of 4?

Back

4.

Front

If a line has a slope of 5/8, what is the slope of a line perpendicular to it?

Back

-8/5.

Front

What does it mean for two lines to be opposite reciprocals?

Back

Their product is -1.

Front

If two lines have slopes of 2 and -1/2, are they perpendicular?

Back

Yes, because their slopes are opposite reciprocals.

Front

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

Back

They are equal.