Bill is a software salesman. Let y represent his total pay (in dollars). Let x represent the number of copies of English is Fun he sells. Suppose that x and y are related by the equation y = 1600+ 120x. 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 Bill's total pay for each copy of English is Fun he sells? $0 What is Bill's total pay if he doesn't sell any copies of English is Fun? S Español​