Parallel and Perpendicular Lines

Front

Slopes of parallel lines are...

Back

the same.

Front

Slopes of perpendicular lines are...

Back

negative reciprocals.

Front

If two lines have the same slope, they are...

Back

Parallel.

Front

If the product of the slopes of two lines is -1, they are...

Back

Perpendicular.

Front

What is the slope of a line that is vertical?

Back

Undefined.

Front

What is the slope of a line that is horizontal?

Back

0.

Front

Given the equations y = 2x + 3 and y = 2x - 5, these lines are...

Back

Parallel.

Front

Given the equations y = 1/2x + 1 and y = -2x + 4, these lines are...

Back

Perpendicular.

Front

What is the slope of the line passing through the points (1, 2) and (3, 6)?

Back

2.

Front

What is the slope of the line passing through the points (0, 0) and (4, 4)?

Back

1.