Solve the linear system of equations. If the system is inconsistent, indicate this. 
Definitions:
Sales Volume
The amount of sales achieved by a business in a specific period, usually measured in units or revenue.
Fixed Cost
Expenses that do not change in relation to the volume of production or sales, such as rent, salaries, and insurance.
Average Property Tax
The typical amount levied on real estate by a government authority, calculated as a percentage of assessed property value and averaged across similar properties or regions.
Sales Volume
The number of units of a product sold in a given period, often used to measure the business activity level.
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