如图，10块相同的长方形墙砖拼成一个矩形，设长方形墙砖的长和宽分别为x厘米和y厘米，则依题意列方程组正确的是( )

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A： $\{\begin{matrix} x + 2 y = 75 \\ y = 3 x \end{matrix}$

B： $\{\begin{matrix} x + 2 y = 75 \\ x = 3 y \end{matrix}$

C： $\{\begin{matrix} 2 x - y = 75 \\ y = 3 x \end{matrix}$

D： $\{\begin{matrix} 2 x + y = 75 \\ x = 3 y \end{matrix}$

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B

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