The constant of proportionality is 15 books per shelf.
If you look at the graph, you can see that for every 1 shelf, there are 15 books. For 1 shelf, there are 15 books, and for 2 shelves, there are 30. And the pattern continues.
Let me know if you have any questions, thanks!
Answer:
15
Step-by-step explanation:
Answer:MATHPAPA.COM
how do i answer that I don't even know that sorry