Parallel and Perpendicular Slopes

Front

What is the definition of parallel lines in terms of slope?

Back

Parallel lines have the same slope.

Front

What is the definition of perpendicular lines in terms of slope?

Back

Perpendicular lines have slopes that are negative reciprocals of each other.

Front

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

Back

2

Front

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

Back

1/3 (the negative reciprocal of -3).

Front

What is the slope of a line that is parallel to a line with a slope of 5/2?

Back

5/2.

Front

What is the slope of a line that is perpendicular to a line with a slope of 1/4?

Back

-4 (the negative reciprocal of 1/4).

Front

If a line has a slope of 0, what can be said about lines parallel to it?

Back

Lines parallel to it will also have a slope of 0, meaning they are horizontal.

Front

If a line has an undefined slope, what can be said about lines parallel to it?

Back

Lines parallel to it will also have an undefined slope, meaning they are vertical.

Front

What is the slope of a line that is perpendicular to a line with a slope of -1?

Back

1 (the negative reciprocal of -1).

Front

How do you find the slope of a line given two points?

Back

Use the formula (y2 - y1) / (x2 - x1).