Parallel and Perpendicular Slopes

Front

What are the slopes of parallel lines?

Back

Identical.

Front

What are negative reciprocals?

Back

Two numbers whose product is -1.

Front

If m = 4 and m = -1/4, how do the lines relate?

Back

Perpendicular.

Front

If m = 7 and m = -7, how do the lines relate?

Back

Neither.

Front

If m = -1/3 and m = -1/3, how do the lines relate?

Back

Parallel.

Front

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

Back

The slope is -1/m.

Front

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

Back

The slope is m.

Front

If two lines have slopes that are negative reciprocals, how do they relate?

Back

They are perpendicular.

Front

What is the product of the slopes of two perpendicular lines?

Back

-1.

Front

What is the slope of a horizontal line?

Back

0.