y = −3x
4x + y = 15
The solution to the given system of equations is (x, y). What is the value of x?

Question

y = −3x 4x + y = 15 The solution to the given system of equations is (x, y). What is the value of x?

Accepted Answer

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 system into the second equation yields 4x + (−3x) = 15, or x = 15. 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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