Parallel and Perpendicular Lines

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). Their slopes are negative reciprocals of each other.

Front

If two lines are parallel, what can be said about their slopes?

Back

The slopes of parallel lines are equal.

Front

What is the slope of a line that is perpendicular to a line with a slope of 3?

Back

The slope of the perpendicular line is -1/3.

Front

What is the slope of a line that is parallel to a line with a slope of -2?

Back

The slope of the parallel line is -2.

Front

Write the equation of a line that is perpendicular to the y-axis and passes through the point (4, 2).

Back

The equation is y = 2.

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 0, what type of line is it?

Back

It is a horizontal line.

Front

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

Back

It is a vertical line.

Front

Determine the slope of a line that is perpendicular to the line represented by the equation y = 2x + 5.

Back

The slope of the perpendicular line is -1/2.