Question 5-x-15
1.4 Systems of Two Linear Equations - Substitution method
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The solution to the given system of equations is . What is the value of ?
A.
B.
C.
D.
5 x = 15 - 4 x + y = - 2 The solution to the
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. Adding the second equation of the given system to the first equation yields , which is equivalent to . So 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 .
Choice D is incorrect and may result from conceptual or calculation errors.
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