Parallel and Perpendicular Lines

Front

What is the definition of parallel lines?

Back

Parallel lines are lines in a plane that never meet. They have the same slope.

Front

What is the definition of perpendicular lines?

Back

Perpendicular lines are lines that intersect at a right angle (90 degrees). The slopes of perpendicular lines 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

The slope of a line parallel to it is also 2.

Front

If a line has a slope of 3/4, what is the slope of a line perpendicular to it?

Back

The slope of a line perpendicular to it is -4/3.

Front

Back

Front

Back

Front

Back

Front

Back

They are perpendicular.

Front

Back

The slope is -5.

Front

If two lines have slopes of 1/2 and 2, are they parallel, perpendicular, or neither?

Back

They are neither.