Austin 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 y = 2100+90x. 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 Austin's total pay for each copy of History is Fun he sells? What is Austin's total pay if he doesn't sell any copies of History is Fun?

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