Let y represent the total cost of publishing a book (in dollars). let x represent the number of copies of the book printed. suppose that x and y are related
by the equation 15x+1100 = y.

or

step-by-step explanation:

we need to solve for 'x' the following equation:  

we have that:

⇒

⇒ ⇒

factorizing, we get that:

  ⇒

then, the solutions are: or

nothing extraneous has been found!