Question

the scatterplot shows the relationship between the number of chapters and the total number of pages for several books. use the trend line to predict how many chapters would be in a book with 180 pages.
12 chapters
21 chapters
18 chapters
15 chapters
1/4 what is the slope of the trend line in the scatterplot?

Explanation:

Step1: Select two points on the trend line

Let's choose \((20, 2)\) and \((200, 20)\)

Step2: Use the slope formula \(m=\frac{y_2 - y_1}{x_2 - x_1}\)

Here \(x_1 = 20,y_1=2,x_2 = 200,y_2 = 20\)

$$m=\frac{20 - 2}{200 - 20}=\frac{18}{180}=\frac{1}{10}$$

Answer:

\(\frac{1}{10}\)