SAT Mathematics Practice Test 5

Adding the two equations side by side eliminates $\mathit{y}$ and yields$\mathit{x}=6$, as shown
$\frac{1}{2}\mathit{y}=4$
$\mathit{x}-\frac{1}{2}\mathit{y}=2$
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$\mathit{x}+0=6$

If $\left(\mathit{x},\mathit{y}\right)$ is a solution to the system, then (x, y) satisfies both equations in the system and any equation derived from them. Therefore, $\mathit{x}=6.$
Choices A, B, and C are incorrect and may be the result of errors when solving the system.