Question 8-x-y-
The solution to the given system of equations is . What is the value of ?
8 x + y = 5 y = 9 x + 1 The solution to the
Hard-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 B is correct. The second equation in the given system is . Substituting for in the first equation in the given system yields , which is equivalent to . Subtracting from both sides of this equation yields . Dividing both sides of this equation by yields .
Choice A is incorrect and may result from conceptual or calculation errors.
Choice C is incorrect and may result from conceptual or calculation errors.
Choice D is incorrect and may result from conceptual or calculation errors.
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