The graph shows the total number of pages a student has read, , over hours. The line passes through the origin and the point .
According to the graph, what does the slope of the line represent in this context, and what is its value?
The student reads 4 pages per hour; the slope is 4.
The student reads 5 pages per hour; the slope is 5.
The student reads 20 pages per hour; the slope is 20.
The student reads 80 pages per hour; the slope is 80.
