3.4 - 3.5 - Parallel & Perpendicular Lines

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 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) between two points on the line.

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 (the slopes are opposite reciprocals).

Front

What does 'm' represent in the equation y = mx + b?

Back

'm' represents the slope of the line.

Front

What does 'b' represent in the equation y = mx + b?

Back

'b' represents the y-intercept of the line.

Front

How do you find the slope between two points (x1, y1) and (x2, y2)?

Back

Slope (m) = (y2 - y1) / (x2 - x1).

Front

What is the slope of a line parallel to y = 3x + 5?

Back

The slope is 3.

Front

What is the slope of a line perpendicular to y = 2x + 1?

Back

The slope is -1/2 (the opposite reciprocal of 2).