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Math·Algebra·Linear equations in two variables

hard

$x$	$y$
-2	19
0	31
2	43

The table shows three values of $x$ and their corresponding values of $y$. The linear relationship between $x$ and $y$ can be represented by an equation written in the form $Ax+By=C$, where $A$, $B$, and $C$ are constants. What is the value of $\frac{A}{B}$?

1

-6