Algebra-1

Question Analysis
This question tests the student's ability to use the substitution method to solve a system of linear equations. The system is given in a form where one equation is already solved for one variable, making it straightforward to substitute and solve.

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

Step-by-step Solution
1. The second equation is already in the form .
2. Substitute into the first equation: .
3. Simplify to get , so

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