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Algebra
/ Systems of two linear equations in two variables
Difficulty: Medium
The solution to the given system of equations is . What is the value of ?
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Explanation
Choice C is correct. It's given by the first equation in the system that . Substituting for in the equation yields , or .
Choice A is incorrect and may result from conceptual or calculation errors.
Choice B is incorrect and may result from conceptual or calculation errors.
Choice D is incorrect and may result from conceptual or calculation errors.