Deandre is a software salesman. let represent his total pay (in dollars). let represent the number of copies of english is fun he sells. suppose that and are related by the equation . 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.
(a) what is the change in deandre's total pay for each copy of english is fun she sells?
(b) what is deandre's total pay if she doesn't sell any copies of english is fun?