Finding slope given 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

What does a slope of 0 indicate about a line?

Back

The line is horizontal.

Front

What does an undefined slope indicate about a line?

Back

The line is vertical.

Front

If the slope is positive, what does that tell you about the line's direction?

Back

The line rises from left to right.

Front

If the slope is negative, what does that tell you about the line's direction?

Back

The line falls from left to right.

Front

Calculate the slope of the line through the points (1, 2) and (4, 5).

Back

m = (5 - 2) / (4 - 1) = 3/3 = 1.

Front

Calculate the slope of the line through the points (3, 7) and (3, 2).

Back

The slope is undefined because the x-coordinates are the same.

Front

What is the slope of the line through the points (0, 0) and (5, 0)?

Back

The slope is 0 because the line is horizontal.

Front

What is the slope of the line through the points (2, 3) and (2, 8)?

Back

The slope is undefined because the line is vertical.

Front

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

Back

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