Question

A librarian is organizing books on a shelf. At the beginning of the day, there were already a certain number of books on the shelf; the librarian is adding more books each hour. This situation is described by the equation:
y=18x+72
In the equation, x represents the number of hours the librarian works, and y is the total number of books on the shelf.
What is the meaning of the initial value of the equation?
A.

It means there are 18 books on the shelf at the beginning of the day.
B.

It means there are 72 books on the shelf at the beginning of the day.
C.

It means the librarian adds 18 books each hour.
D.

It means the librarian adds 72 books each hour.

Answer 1

B.

The initial value is the y-intercept 72, which is the number of books on the shelf when x = 0 (at the beginning of the day).