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Algebra
/ Systems of two linear equations in two variables
Difficulty: Easy
The solution to the given system of equations is . What is the value of ?
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Explanation
Choice A is correct. According to the first equation in the given system, . Substituting for in the second equation in the given system yields , or .
Choice B is incorrect and may result from conceptual or calculation errors.
Choice C is incorrect. This is the value of , not .
Choice D is incorrect and may result from conceptual or calculation errors.