Parallel and Perpendicular Lines

Front

What are parallel lines?

Back

Lines that never intersect and are always the same distance apart.

Front

What are perpendicular lines?

Back

Lines that intersect at a right angle (90 degrees).

Front

What is the slope of parallel lines?

Back

Parallel lines have the same slope.

Front

What is the slope of perpendicular lines?

Back

The slopes of perpendicular lines are opposite reciprocals.

Front

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

Back

-1/2.

Front

What does it mean for two lines to intersect?

Back

It means they cross each other at a point.

Front

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

Back

If the slopes of the lines are equal, they are parallel.

Front

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

Back

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

Front

What is the equation of a line in slope-intercept form?

Back

y = mx + b, where m is the slope and b is the y-intercept.

Front

What is the slope of the line represented by the equation y = 4x + 1?

Back

4.