Slopes of Parallel and Perpendicular Lines

Front

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

Back

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

Front

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

Back

The slope of a line perpendicular to a line with slope m is -1/m.

Front

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

Back

They are parallel lines.

Front

If two lines have slopes that are negative reciprocals of each other, what can we say about them?

Back

They are perpendicular lines.

Front

Back

The slope is 2.

Front

Back

The slope is -\frac{1}{3}.

Front

Back

Front

Back

They are parallel.

Front

Back

They are neither.

Front

Back