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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 D is correct. It's given by the first equation in the given system of equations that . Substituting for in the second equation in the given system yields , or . Therefore, the value of is .
Choice A is incorrect and may result from conceptual or calculation errors.
Choice B is incorrect. This is the value of , not the value of .
Choice C is incorrect and may result from conceptual or calculation errors.