Parallel and Perpendicular Slopes

Front

What are parallel lines?

Back

Lines that have the same slope and never intersect.

Front

What are perpendicular lines?

Back

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

Front

What is the slope of a line?

Back

The slope is a measure of the steepness of a line, calculated as the rise over run (change in y over change in x).

Front

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

Back

They are parallel if m1 = m2.

Front

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

Back

They are perpendicular if m1 * m2 = -1.

Front

What is the slope of the line y = 3x + 1?

Back

The slope is 3.

Front

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

Back

The slope is -2/3.

Front

What is the opposite reciprocal of 3?

Back

The opposite reciprocal of 3 is -1/3.

Front

What is the opposite reciprocal of -2/3?

Back

The opposite reciprocal of -2/3 is 3/2.

Front

Write the equation of a line with slope 2 that passes through the point (0, 3).

Back

y = 2x + 3.