Comic book collection

To start her collection of comic books, Joylin's uncle gives Joylin a box of comic books and several monthly subscriptions to comic books.  The number of comic books in her collection, y, after x months is modeled by the equation shown.
      
          y = 40 + 6x

What does the number 40 represent in this equation?

A.)  the price of a comic book subscription
B.)  the number of months of Joylin's subscriptions
C.)  the number of comic books in the box she received
D.)  the number of title subscriptions Joylin received each month

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The equation y = 40 + 6x, in slope-intercept form is y = 6x + 40
the slope = 6, which would be the number of comic books received each month, x.
the y-intercept = 40, which would represent the number of comic books she has before receiving her monthly
subscriptions.

The explanation states y is the number of comic books in her collection.
Therefore if the number of months, x, was zero, then y (the number of comic books in her collection) would still equal 40.

C.)  the number of comic books in the box she received

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