Find an equation in rectangular coordinates, and then identify the surface. 
Definitions:
Price Elasticity
The determination of how demand for a product is influenced by alterations in its price.
Price Elasticity
Price elasticity measures the responsiveness of the quantity demanded or supplied of a good to a change in its price, indicating how changes in price affect consumer demand or supply levels.
Total Expenditures
The total amount of money spent by consumers on goods and services within a specific period.
Total Revenue
The total amount of money a firm receives from selling its goods or services.
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