Parallel or Perpendicular?

Front

What are parallel lines?

Back

Lines that never intersect and have the same slope.

Front

What are perpendicular lines?

Back

Lines that intersect at a right angle (90 degrees) and have slopes that are opposite reciprocals.

Front

If two lines have the same slope, what can we conclude about them?

Back

They are parallel.

Front

If the slopes of two lines are opposite reciprocals, what can we conclude about them?

Back

They are perpendicular.

Front

What is the slope of the line y = 2x + 3?

Back

The slope is 2.

Front

What is the slope of the line y = -4x + 1?

Back

The slope is -4.

Front

Determine if the lines y = 5x + 1 and y = 5x - 2 are parallel, perpendicular, or neither.

Back

They are parallel.

Front

Determine if the lines y = 1/2x + 3 and y = -2x + 1 are parallel, perpendicular, or neither.

Back

They are perpendicular.

Front

What is the slope of a horizontal line?

Back

The slope is 0.

Front

What is the slope of a vertical line?

Back

The slope is undefined.