Scott is a software salesman. Let represent his total pay (in dollars). Let represent the number of copies of History is Fun he sells. Suppose that and are related by the equation 80x+2100=y Answer the questions below.
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 Scott's total pay for each copy of History is Fun he sells?

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