Question y-3-x-
The solution to the given system of equations is . What is the value of ?
y = - 3 x 4 x + y = 15 The solution to the given
Medium-difficulty · SAT Math · Systems of Two Linear Equations — Substitution method. Read the question above, select your answer, and check the full explanation below to understand exactly why the correct choice works.
Answer 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 .
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