Parallel and Perpendicular Slopes

Front

What are the slopes of perpendicular lines?

Back

The slopes of perpendicular lines are opposite reciprocals.

Front

What is the slope of a vertical line?

Back

The slope of a vertical line is undefined.

Front

If the slopes of two lines are m = 4 and m = -1/4, what relationship do these lines have?

Back

These lines are perpendicular.

Front

If the slopes of two lines are m = -1/3 and m = -1/3, what relationship do these lines have?

Back

These lines are parallel.

Front

What does it mean for two slopes to be negative reciprocals of each other?

Back

Two slopes are negative reciprocals if the product of the slopes is -1.

Front

What is the slope of a horizontal line?

Back

The slope of a horizontal line is 0.

Front

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

Back

Two lines are parallel if their slopes are equal.

Front

What is the relationship between the slopes of two lines that intersect at a right angle?

Back

The slopes of two lines that intersect at a right angle are opposite reciprocals.

Front

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

Back

The slope of a line that is perpendicular to a line with a slope of 2 is -1/2.

Front

What is the formula to find the slope between two points (x1, y1) and (x2, y2)?

Back

The formula for slope is (y2 - y1) / (x2 - x1).