4.1 - 4.2

Front

What is the formula to calculate the slope of a line?

Back

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

Front

What does a positive slope indicate about a line?

Back

A positive slope indicates that as x increases, y also increases.

Front

What does a negative slope indicate about a line?

Back

A negative slope indicates that as x increases, y decreases.

Front

What is the slope of a horizontal line?

Back

The slope of a horizontal line is zero.

Front

What is the slope of a vertical line?

Back

The slope of a vertical line is undefined.

Front

How do you identify a positive slope on a graph?

Back

A positive slope rises from left to right.

Front

How do you identify a negative slope on a graph?

Back

A negative slope falls from left to right.

Front

What is the slope of the line that passes through the points (2, 3) and (4, 7)?

Back

Slope = (7 - 3) / (4 - 2) = 4 / 2 = 2.

Front

What is the slope of the line that passes through the points (1, 1) and (1, 5)?

Back

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

Front

What does a slope of zero mean in practical terms?

Back

A slope of zero means there is no change in y as x changes; the line is flat.