Parallel or Perpendicular

Front

What does it mean for two lines to be parallel?

Back

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

Front

What does it mean for two lines to be perpendicular?

Back

Two lines are perpendicular if the product of their slopes (m1 * m2) equals -1.

Front

If the slope of line A is m = 2/3, what is the slope of a line parallel to it?

Back

The slope of a line parallel to line A is also m = 2/3.

Front

If the slope of line A is m = 3/2, what is the slope of a line perpendicular to it?

Back

The slope of a line perpendicular to line A is m = -2/3.

Front

What is the slope of a horizontal line?

Back

The slope of a horizontal line is m = 0.

Front

What is the slope of a vertical line?

Back

The slope of a vertical line is undefined.

Front

If line A has a slope of m = 0, what type of line is it?

Back

Line A is a horizontal line.

Front

If line A has an undefined slope, what type of line is it?

Back

Line A is a vertical line.

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 line A has a slope of m = 5/3, what is the slope of a line perpendicular to it?

Back

The slope of a line perpendicular to line A is m = -3/5.