Parallel and Perpendicular Slopes

Front

What is the slope of parallel lines?

Back

Parallel lines have the same slope.

Front

What are negative reciprocals?

Back

Two numbers are negative reciprocals if their product is -1.

Front

Find the slope of a line perpendicular to y = 2x + 4.

Back

-1/2

Front

What describes the slopes m = 5 and m = -1/5?

Back

Perpendicular

Front

Find the slope of a line parallel to y = 2x + 4.

Back

2

Front

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

Back

m1 = m2.

Front

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

Back

m1 * m2 = -1.

Front

What is the slope of the line y = 3x + 1?

Back

3

Front

What is the slope of the line y = -4x + 2?

Back

-4

Front

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

Back

A horizontal line.