Algebra-1

Question Analysis
This question evaluates the student's understanding of the substitution method by providing a system of equations where one equation is already in the form . 

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. The first equation is already in the form .
2. Substitute into the second equation: .
3. Simplify the equation: .
4. Add 1 to both sides:

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