No because u have to have 9 or 9 or 8 and 8
Answer: The slope of the line is 
Step-by-step explanation:
The slope of a line can be calculated with the following formula:

Then, given the points
and
, you can identify that:

Knowing these values you can substitute them into the formula for calculate the slope:

Finally, evaluating, you get that the slope of that line is:

Solve each one to find that D is the answer
(1/3)x =16 (x represents the total number of books he has)
x=48