Slopes of Lines: Parallel and Perpendicular Lines

Front

What is the formula to calculate the slope (m) between two points (x1, y1) and (x2, y2)?

Back

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

Front

What does it mean for two lines to be parallel?

Back

Two lines are parallel if they have the same slope and will never intersect.

Front

What does it mean for two lines to be perpendicular?

Back

Two lines are perpendicular if the product of their slopes is -1.

Front

Find the slope between the points (-7, -13) and (1, -5).

Back

1

Front

Find the slope of a horizontal line.

Back

0

Front

Find the slope of a vertical line.

Back

Undefined

Front

Given points P(2, -1) and Q(-3, -1), what is the slope m(PQ)?

Back

0 (horizontal line)

Front

Given points R(-11, 9) and S(-7, 9), what is the slope m(RS)?

Back

0 (horizontal line)

Front

Given points P(-4, 17) and Q(1, -3), what is the slope m(PQ)?

Back

-4

Front

Given points R(-9, 3) and S(-5, 4), what is the slope m(RS)?

Back

1/4