Mrs. Kim's Parallel and Perpendicular Lines

Front

What are parallel lines?

Back

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

Front

What are perpendicular lines?

Back

Perpendicular lines are lines that intersect at a right angle (90 degrees). Their slopes are opposite reciprocals.

Front

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

Back

They are perpendicular.

Front

What is the slope of a line that is perpendicular to the line y = 4x + 1?

Back

The slope is -1/4.

Front

What do you call the slope of a line that is the same as another line?

Back

Identical slopes.

Front

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

Back

The slope of the parallel line is also 3.

Front

What is the relationship between the slopes of two lines that are neither parallel nor perpendicular?

Back

Their slopes are neither identical nor opposite reciprocals.

Front

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

Back

If the product of their slopes is -1, the lines are perpendicular.

Front

What is the slope of the line y = -5x + 3?

Back

The slope is -5.

Front

If two lines have slopes of 1/3 and 3, what can you say about them?

Back

They are perpendicular.