Determine slope of lines parallel and perpendicular

Front

What is the slope of a line?

Back

The slope of a line is a measure of its steepness, usually represented as 'm'. It is calculated as the change in y (rise) over the change in x (run).

Tags

CCSS.8.EE.B.5

Front

What does it mean for two lines to be parallel?

Back

Two lines are parallel if they have the same slope and will never intersect.

Tags

CCSS.8.EE.B.5

Front

What does it mean for two lines to be perpendicular?

Back

Two lines are perpendicular if the product of their slopes is -1. This means that one slope is the negative reciprocal of the other.

Tags

CCSS.8.EE.B.6

Front

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

Back

The slope of a line parallel to it will also be 2.

Tags

CCSS.8.EE.B.5

Front

If a line has a slope of 3, what is the slope of a line perpendicular to it?

Back

The slope of a line perpendicular to it will be -1/3.

Tags

CCSS.8.EE.B.6

Front

What is the slope of a vertical line?

Back

The slope of a vertical line is undefined.

Tags

CCSS.8.EE.B.5

Front

What is the slope of a horizontal line?

Back

The slope of a horizontal line is 0.

Tags

CCSS.8.EE.B.5

Front

How do you find the slope from two points (x1, y1) and (x2, y2)?

Back

The slope (m) is calculated using the formula m = (y2 - y1) / (x2 - x1).

Tags

CCSS.8.EE.B.5

Front

What is the slope of a line that is perpendicular to a horizontal line?

Back

The slope of a line that is perpendicular to a horizontal line is undefined.

Tags

CCSS.8.EE.B.5

Front

What is the slope of a line that is perpendicular to a vertical line?

Back

The slope of a line that is perpendicular to a vertical line is 0.

Tags

CCSS.8.EE.B.5