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Math·Algebra·Linear equations in two variables

hard

$x$	$y$
$-2s$	18
$-s$	15
$s$	9

The table shows three values of $x$ and their corresponding values of $y$, where $s$ is a constant. There is a linear relationship between $x$ and $y$. Which of the following equations represents this relationship?

A

$sx+3y=12s$

B

$3x+sy=12s$

C

$3x+sy=12$

D

$sx+3y=12$