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Math·Algebra·Linear equations in two variables

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$x$	$y$
$-6$	$48$
$-3$	$39$
$3$	$21$
$6$	$12$

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

A

$9x+3y=90$

B

$9x+3y=3$

C

$3x+9y=90$

D

$3x+9y=3$