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Math·Algebra·Linear equations in two variables

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Amount of salt (grams)	Amount of water (liters)
217	7
248	8
279	9

There is a linear relationship between the amount of salt $x$, in grams, and the amount of water $y$, in liters, in a certain body of seawater. The table shows this relationship for three samples of this seawater. Which equation represents this relationship?

A

$y=\frac{1}{62}x$

B

$y=\frac{1}{31}x$

C

$y=31x$

D

$y=62x$