Algebra-1

Question Analysis
This question assesses the student's ability to apply the substitution method to solve a system of linear equations. One of the equations is already solved for , making it easy to substitute into the other equation.

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

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

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