Shen 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=1900+70x

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 Shen's total pay for each copy of English is Fun he sells?

What is Shen's total pay if he doesn't sell any copies of English is Fun?