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The scatter plot shows the relationship between the number of chapters and the total number of page’s for several books

The scatter plot shows the relationship between the number of chapters and the total-example-1

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we have

x ----> number of chapters

y ---> number of pages

In this problem

we have a proportional relationship between the variables x and y (because the line passes through the origin)

so

The linear equation is of the form

y=Kx

where k is the constant of proportionality

K=y/x

looking at the graph

we take the point (4,40)

so

k=40/4=10

the equation is

y=10x

For y=180

substitute

180=10x

solve for x

x=180/10

x=18

the answer is 18 chapters

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