Parallel and Perpendicular Slopes

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 opposite reciprocals.

Front

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

Back

2 (the same slope).

Front

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

Back

-1/3 (the opposite reciprocal).

Front

What is the slope of a line that is horizontal?

Back

0 (no rise, only run).

Front

What is the slope of a line that is vertical?

Back

Undefined (no run, only rise).

Front

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

Back

Front

What does it mean if two lines are neither parallel nor perpendicular?

Back

They have different slopes and do not intersect at right angles.

Front

If a line has a slope of -4, what is the slope of a line parallel to it?

Back

-4 (the same slope).

Front

If a line has a slope of 1/2, what is the slope of a line perpendicular to it?

Back

-2 (the opposite reciprocal).