Finding Slope from Two Points

Front

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

Back

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

Front

Find the slope of the line that passes through the points (1, -2) and (-2, 7).

Back

m = (7 - (-2)) / (-2 - 1) = 9 / -3 = -3

Front

Find the slope of the line that passes through the points (-6, -8) and (-7, 0).

Back

m = (0 - (-8)) / (-7 - (-6)) = 8 / -1 = -8

Front

Find the slope of the line that passes through the points (-1, 2) and (2, 5).

Back

m = (5 - 2) / (2 - (-1)) = 3 / 3 = 1

Front

Find the slope of the line that passes through the points (6, -6) and (-4, 0).

Back

m = (0 - (-6)) / (-4 - 6) = 6 / -10 = -3/5

Front

Find the slope of the line that passes through the points (13, 0) and (9, -4).

Back

m = (-4 - 0) / (9 - 13) = -4 / -4 = 1

Front

What does a positive slope indicate about a line?

Back

A positive slope indicates that the line rises as it moves from left to right.

Front

What does a negative slope indicate about a line?

Back

A negative slope indicates that the line falls as it moves from left to right.

Front

What does a slope of zero indicate about a line?

Back

A slope of zero indicates a horizontal line.

Front

What does an undefined slope indicate about a line?

Back

An undefined slope indicates a vertical line.