Identifying Parallel and Perpendicular Slopes

Front

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

Back

The slope of a line that is parallel to a line with slope m is also m.

Front

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

Back

The slope of a line that is perpendicular to a line with slope m is -1/m (the opposite reciprocal).

Front

If the slope of one line is 2, what is the slope of a line that is parallel to it?

Back

The slope of a line that is parallel to it is also 2.

Front

If the slope of one line is -3, what is the slope of a line that is perpendicular to it?

Back

The slope of a line that is perpendicular to it is 1/3 (the opposite reciprocal).

Front

What are opposite reciprocals?

Back

Opposite reciprocals are two numbers whose product is -1. For example, if one slope is 2, the opposite reciprocal is -1/2.

Front

What is the slope of a line with a slope of 0?

Back

The slope of a line with a slope of 0 is horizontal.

Front

What is the slope of a vertical line?

Back

The slope of a vertical line is undefined.

Front

If two lines have slopes of 1/2 and -2, what can we say about their relationship?

Back

The lines are perpendicular because their slopes are opposite reciprocals.

Front

What is the relationship between the slopes of parallel lines?

Back

The slopes of parallel lines are identical.

Front

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

Back

The slope of a line that is perpendicular to it is -1/5.