Rachel is a software saleswoman.
Let y represent her total pay (in dollars). Let x represent the number of copies of History is Fun she sells. Suppose that x and y are related by the equation y=2300 + 120x.
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 Rachel’s pay for each copy of History is Fun she sells ?
What is Rachel’s total pay if she doesn’t sell any copies of History is Fun ?