Final answer:
The equation b = 6m accurately represents the monthly increase in the number of books at the Copper Hill School Library, and is therefore true.
Step-by-step explanation:
The student's question is regarding the validity of the equation b = 6m, which describes the number of books, b, the Copper Hill School Library receives after m months, given that they receive an average of 6 books each month. This equation is true as it directly represents the relationship where the total number of books is the product of 6 books per month and the number of months passed.