Front

Slopes of parallel lines are...

Back

the same.

Front

Are these lines parallel, perpendicular, or neither?

Back

parallel

Front

Are the equations parallel, perpendicular, or neither?

Back

Parallel

Front

Are these lines parallel, perpendicular, or neither?

Back

perpendicular

Front

Slopes of perpendicular lines are...

Back

opposite reciprocals.

Front

Definition of parallel lines.

Back

Lines that never intersect and have the same slope.

Front

Definition of perpendicular lines.

Back

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

Front

What is the slope of a line?

Back

The ratio of the rise (vertical change) to the run (horizontal change).

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.