Question if-is-
If 
is the solution to the system of equations above, what is the value of 
?
5
13
If is the solution to the system of equations above, what is the value of ?
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. Subtracting the second equation, 
, from the first equation, 
, results in 
, or 
. Combining like terms on the left-hand side of this equation yields 
.
Choice A is incorrect and may result from miscalculating 
as . Choice C is incorrect and may result from miscalculating as 5. Choice D is incorrect and may result from adding 9 to 4 instead of subtracting 9 from 4.
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