Question

Use the image to answer the question.

A line is plotted on a coordinate plane. The x-axis representing hours ranges from negative 1 to 10 in unit increments. The y-axis representing height in inches ranges from negative 1 to 10 in unit increments.
▼Click for Long Desc
The line passes through left parenthesis 0 comma 10 right parenthesis, left parenthesis 4 comma 6 right parenthesis, and left parenthesis 10 comma 0 right parenthesis. All values are approximate.

The graph represents the amount of rainfall, shown by a rain measuring device, over time as a storm is subsiding. What is the rate at which the rainfall is decreasing?

(1 point)
The rainfall is decreasing at a rate of __ inch(es) per hour.

Remember that the rate is simply the slope for the given line.

Answer 1

Slope = (0 − 10)/(10 − 0) = −1.

So the rainfall is decreasing at 1 inch per hour (slope = −1 inch/hour).