Parallel, Perpendicular, or Neither

Front

What is the definition of parallel lines?

Back

Parallel lines are lines in a plane that never meet. They have the same slope.

Front

What is the definition of perpendicular lines?

Back

Perpendicular lines are lines that intersect at a right angle (90 degrees). The slopes of perpendicular lines are negative reciprocals of each other.

Front

If a line has a slope of m, what is the slope of a line parallel to it?

Back

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

Front

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

Back

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

Front

What is the slope of a line with a slope of -6/5?

Back

The slope of a line with a slope of -6/5 is -6/5.

Front

What is the slope of a line perpendicular to a line with slope -6/5?

Back

The slope of a line perpendicular to a line with slope -6/5 is 5/6.

Front

If a line has a slope of 3, what is the slope of a line that is parallel to it?

Back

The slope of a line that is parallel to it is 3.

Front

If a line has a slope of -1/7, what is the slope of a line that is perpendicular to it?

Back

The slope of a line that is perpendicular to it is 7.

Front

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

Back

Two lines are parallel if their slopes are equal.

Front

How can you determine if two lines are perpendicular using their slopes?

Back

Two lines are perpendicular if the product of their slopes is -1.