Algebra-1

Question Analysis
This question tests the student's ability to use the substitution method to solve a system of linear equations. The given system is straightforward, with one equation already in the form .

Key Concept Explanation
The substitution method involves expressing one variable in terms of the other and substituting this expression into the other equation to eliminate one variable.

Step-by-step Solution
1. Start with the system of equations:
2. Substitute into the second equation:
3. Simplify the equation:
4. Combine like terms:

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