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Math·Algebra·Linear equations in two variables

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An initial mixture consists of $300\text{ grams}$ of metal X and $20\text{ grams}$ of metal Y. During a lab experiment, for each $8\text{ grams}$ of metal X that are added to the initial mixture, $16\text{ grams}$ of metal Y are also added to the initial mixture. For the resulting mixture, which of the following equations gives $y$, the total mass of metal Y, in grams, when the total mass of metal X is $x\text{ grams}$?

A

$y=2x+20$

B

$y=35x+20$

C

$y=4x-292$

D

$y=2x-580$