Solve the system using the elimination method. 
Definitions:
Subjective Approach
A method of decision-making or valuation based on personal judgments and opinions rather than objective data.
Risk Classes
Categories of investments grouped together based on their similar level of risk.
Discount Rates
The interest rate used in discounted cash flow (DCF) analysis to determine the present value of future cash flows.
Cost of Equity
The return a company requires to decide if an investment meets capital return requirements, often used in capital budgeting to evaluate potential projects.
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