Question the-sy
1.4 Systems of Two Linear Equations - Elimination method
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The system of equations above has solution (x, y). What is the value of x ?
A.
4
B.
6
C.
3
D.
The system of equations above has solution ( x , y ). What is the value
Hard-difficulty · SAT Math · Systems of Two Linear Equations — Elimination 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. Adding the corresponding sides of the two equations eliminates y and yields 
, as shown.
If (x, y) is a solution to the system, then (x, y) satisfies both equations in the system and any equation derived from them. Therefore, .
Choices A, B, and C are incorrect and may be the result of errors when solving the system.
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