Writing an equation and drawing its groph to model a real-world situation... Jina earns 13 dollars each hour working part-time at a bookstore. She earns one additional dollar for each book that she sells. Let $A$ be the amount (In dollars) that Jina earns in an hour if she sells $B$ books. Write an equation relating $A$ to $B$. Then graph your equation using the axes below.

Step 1 ：Let's denote the amount (in dollars) that Jina earns in an hour if she sells B books as A. Jina earns 13 dollars each hour working part-time at a bookstore. She earns one additional dollar for each book that she sells. So, we can write an equation relating A to B as \(A = B + 13\).

Step 2 ：The graph of this equation is a straight line with a slope of 1 and a y-intercept of 13. This means that for every book Jina sells, her earnings increase by 1 dollar, and she starts with a base earning of 13 dollars per hour.

Step 3 ：Final Answer: The equation relating A to B is \(\boxed{A = B + 13}\).