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 y=1150+10x .

What is the change in the total cost for each book printed?

What is the cost to get started (before any books are printed)?

Question

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 y=1150+10x .

What is the change in the total cost for each book printed?
 
What is the cost to get started (before any books are printed)?

Mercury · Answer

notice how x is the number of copies of the book printed

therefore, the # being multiplied to x, is the cost per book 
(think: cost per book * number of books = total cost of all the books)

the cost to get started is constant, so it's not dependent on x, and therefore is the # not being multiplied to x