Slope / Parallel and Perpendicular Lines

Front

What is the slope formula?

Back

The slope formula is m = (y2 - y1) / (x2 - x1), where m is the slope, (x1, y1) and (x2, y2) are two points on the line.

Front

Find the slope given the points (-5,-3) and (2,4).

Back

The slope is 1.

Front

What slope is parallel to: m = 3/4?

Back

The slope parallel to m = 3/4 is also 3/4.

Front

If a line has a slope of -5/6, what is the slope of a line that is parallel to it?

Back

The slope of a line that is parallel to it is -5/6.

Front

Find the slope given the points (3,18) and (0,18).

Back

The slope is 0.

Front

What is the definition of parallel lines?

Back

Parallel lines are lines in a plane that never meet; they have the same slope.

Front

What is the definition of perpendicular lines?

Back

Perpendicular lines are lines that intersect at a right angle (90 degrees); their slopes are negative reciprocals.

Front

What is the slope of a vertical line?

Back

The slope of a vertical line is undefined.

Front

What is the slope of a horizontal line?

Back

The slope of a horizontal line is 0.

Front

How do you determine if two lines are parallel using their slopes?

Back

Two lines are parallel if their slopes are equal.