Parallel and Perpendicular Slopes

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) 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 the same slope, what can we say about them?

Back

They are parallel.

Front

What is the slope of a line perpendicular to a line with a slope of 3?

Back

The slope would be -1/3 (opposite reciprocal).

Front

How do you find the slope of a line given two points (x1, y1) and (x2, y2)?

Back

Use the formula: slope = (y2 - y1) / (x2 - x1).

Front

What is the slope of the line represented by the equation y = 5x + 2?

Back

The slope is 5.

Front

If a line has a slope of 0, what type of line is it?

Back

It is a horizontal line.

Front

If a line has an undefined slope, what type of line is it?

Back

It is a vertical line.

Front

What is the relationship between the slopes of two lines that are parallel?

Back

Their slopes are identical.