y = −3x 4x+y = 15 The solution to the given system of equations (x,y) is. What is the value of x?
Correct answer: C (parsed from the explanation — this source omits an answer key for this item)
Explanation
Choice C is correct. The given system of linear equations can be solved by the - substitution method. Substituting 3x for y from the first equation in the given 4 + -3 =15 =15 system into the second equation yields x ^ xh , or x . 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 y, not the value of x.
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