Carlos is a software salesman. Let y represent his total pay (in dollars). Let x represent the number of copies of History is Fun he sells. Suppose that x and y are related by the equation 2500+110x=y. Note that a change can be an increase or a decrease.
For an increase, use a positive number. For a decrease, use a negative number.


What is the change in Carlos's total pay for each copy of History is Fun he sells?

What is Carlos's total pay if he doesn't sell any copies of History is Fun?