Parallel & Perpendicular Slopes

Front

What are the slopes of parallel lines?

Back

Identical.

Front

What are the slopes of perpendicular lines?

Back

Opposite reciprocals.

Front

If the slope of a line is m = 3/4, what is the slope of a parallel line?

Back

m = 3/4.

Front

If the slope of a line is m = -6/5, what is the slope of a line perpendicular to it?

Back

m = 5/6.

Front

Are the lines y = 4x + 2 and y = -1/4x + 12 perpendicular?

Back

Yes.

Front

What does it mean for two lines to be parallel?

Back

They have the same slope and never intersect.

Front

What does it mean for two lines to be perpendicular?

Back

Their slopes are opposite reciprocals.

Front

If one line has a slope of 2, what is the slope of a line perpendicular to it?

Back

-1/2.

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.