Addison is a salesperson who sells computers at an electronics store. She makes a base pay amount each day and then is paid a commission for every computer sale she makes. Let PP represent Addison's total pay on a day on which she sells xx computers. A graph of PP is shown below. Write an equation for PP then state the slope of the graph and determine its interpretation in the context of the problem.

P=
The slope of the function is ____
which represents _____