Objective Knowledge Check Question 8 Tatyana Esp Ivanna is a software saleswoman. Let y represent her total pay (in dollars). Let x represent the number of copies of Math is Fun she sells. Suppose that x and y are related by the equation 80x + 1600=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 Ivanna's total pay for each copy of Math is Fun she sells? What is Ivanna's total pay if she doesn't sell any copies of Math is Fun? X