Parallel & Perpendicular Slope

Front

What does it mean for two lines to be parallel?

Back

Two lines are parallel if they have the same slope and will never intersect.

Front

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

Back

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

Front

If two lines have slopes of 2 and -1/2, are they parallel, perpendicular, or neither?

Back

They are perpendicular because the product of their slopes is -1 (2 * -1/2 = -1).

Front

What is the slope of a horizontal line?

Back

The slope of a horizontal line is 0.

Front

What is the slope of a vertical line?

Back

The slope of a vertical line is undefined.

Front

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

Back

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

Front

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

Back

Two lines are parallel if their equations are in the form y = mx + b and have the same value of m (slope).

Front

What is the relationship between the slopes of two perpendicular lines?

Back

The slopes of two perpendicular lines are negative reciprocals of each other.

Front

If a line has a slope of -4, what is the slope of a line perpendicular to it?

Back

The slope of a line perpendicular to it is 1/4.

Front

What is the slope of a line that is parallel to the x-axis?

Back

The slope of a line that is parallel to the x-axis is 0.