Parallel and Perpendicular Lines

Front

What are parallel lines?

Back

Lines that never intersect and have the same slope.

Front

What are perpendicular lines?

Back

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

Front

What is the slope of parallel lines?

Back

The slope of parallel lines is the same.

Front

What is the slope of perpendicular lines?

Back

The slopes of perpendicular lines are opposite reciprocals.

Front

If two lines have slopes m1 and m2, when are they parallel?

Back

They are parallel if m1 = m2.

Front

If two lines have slopes m1 and m2, when are they perpendicular?

Back

They are perpendicular if m1 * m2 = -1.

Front

What is the general form of a linear equation?

Back

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

Front

How do you determine if two lines are parallel from their equations?

Back

Convert both equations to slope-intercept form (y = mx + b) and compare slopes.

Front

What does the equation y = 6x + 2 represent?

Back

A line with a slope of 6 and a y-intercept of 2.

Front

What does the equation y = -6x + 2 represent?

Back

A line with a slope of -6 and a y-intercept of 2.