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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 C is correct. The given system of linear equations can be solved by the substitution method. Substituting for from the first equation in the given system into the second 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. This is the absolute value of , not the value of .