Question

Lamar is a software salesman. Let
y
represent his total pay (in dollars). Let
x
represent the number of copies of Math is Fun he sells. Suppose that
x
and
y
are related by the equation
=+80x1600y
.

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 Lamar's total pay for each copy of Math is Fun he sells?
$

What is Lamar's total pay if he doesn't sell any copies of Math is Fun?
$