Parallel and Perpendicular Lines

Front

What are parallel lines?

Back

Lines that have the same slope and never intersect.

Front

What are perpendicular lines?

Back

Lines that intersect at a right angle (90 degrees) and have slopes that are negative reciprocals of each other.

Front

In the equation y = mx + b, what does 'm' represent?

Back

The slope of the line.

Front

In the equation y = mx + b, what does 'b' represent?

Back

The y-intercept, where the line crosses the y-axis.

Front

If two lines have the same slope, what can we conclude about them?

Back

They are parallel.

Front

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

Back

-1/3, since the slopes are negative reciprocals.

Front

What is the slope of a line parallel to the line whose equation is -2x + y = -7?

Back

-2, since parallel lines have the same slope.

Front

How do you find the slope from the equation y = 4x + 3?

Back

The slope is the coefficient of x, which is 4.

Front

What is the relationship between the slopes of two perpendicular lines?

Back

The product of their slopes is -1.

Front

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

Back

A horizontal line.