Equations of parallel and 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 90-degree angle.

Front

If two lines have slopes m1 and m2, what is the relationship if m1 * m2 = -1?

Back

The lines are perpendicular.

Front

What is the slope of a line perpendicular to y = mx + b?

Back

The slope is -1/m.

Front

Identify the relationship: y = 2x + 3 and y = 2x - 5.

Back

Parallel.

Front

Identify the relationship: y = 1/2x + 1 and y = -2x + 4.

Back

Perpendicular.

Front

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

Back

3.

Front

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

Back

-4.

Front

If two lines are neither parallel nor perpendicular, what can be said about their slopes?

Back

Their slopes are neither equal nor negative reciprocals.

Front

What is the equation of a line perpendicular to y = x + 5 that passes through the point (2, 3)?

Back

y = -x + 5.