Find the solution of the system of linear equations described by the following matrix: 
Definitions:
Supplies Used
The value of materials and goods consumed during a company's operations within a specific period.
Book Value
The net value of an asset as recorded on the balance sheet, calculated by subtracting its accumulated depreciation from its original cost.
Fair Value
An estimate of the market value of an asset or liability based on current conditions and willing buyer and seller dynamics, often used for financial reporting purposes.
Salary Allowance
This term refers to a fixed amount or stipend that is given in addition to salary, often for the purpose of covering specific expenses.
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