Parallel & Perpendicular Lines

Front

Slopes of perpendicular lines are...

Back

negative reciprocals.

Front

What is the slope of a line parallel to y = 2x - 7?

Back

2

Front

Slopes of parallel lines are...

Back

the same.

Front

What is the slope of a line perpendicular to y = 2x - 7?

Back

-1/2

Front

What slope is perpendicular to m = 5/8?

Back

-8/5

Front

Definition of parallel lines in geometry.

Back

Lines that never intersect and have the same slope.

Front

Definition of perpendicular lines in geometry.

Back

Lines that intersect at a right angle (90 degrees).

Front

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

Back

When m1 = m2.

Front

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

Back

When m1 * m2 = -1.

Front

Example of two parallel lines: y = 3x + 1 and y = 3x - 4.

Back

Both lines have the same slope of 3.