Question x-10-y
The solution to the given system of equations is . What is the value of ?
x = 10 y = x + 21 The solution to the given system of equations
Easy-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 D is correct. It's given by the first equation in the given system of equations that . Substituting for in the second equation in the given system yields , or . Therefore, the value of is .
Choice A is incorrect and may result from conceptual or calculation errors.
Choice B is incorrect. This is the value of , not the value of .
Choice C is incorrect and may result from conceptual or calculation errors.
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