Parallel and Perpendicular Slopes

Front

What are the slopes of parallel lines?

Back

Identical.

Front

What are the slopes of perpendicular lines?

Back

Opposite reciprocals.

Front

Find the slope of a line perpendicular to the line y = 2x + 4.

Back

-1/2

Front

What can be said about the lines y = 3x + 2 and y = 3x - 3?

Back

They are parallel.

Front

What can be said about the lines y = -2/3x + 2 and y = 3/2x + 9?

Back

They are perpendicular.

Front

If the slope of one line is 4, what is the slope of a line parallel to it?

Back

4.

Front

If the slope of one line is 1/3, what is the slope of a line perpendicular to it?

Back

-3.

Front

What is the slope of a line that is horizontal?

Back

0.

Front

What is the slope of a line that is vertical?

Back

Undefined.

Front

How do you determine if two lines are parallel using their slopes?

Back

If their slopes are identical.