科目: 來源: 題型:選擇題
A. | $\left\{\begin{array}{l}{4x=3y}\\{x=2y-40}\end{array}\right.$ | B. | $\left\{\begin{array}{l}{4x=3y}\\{x=2y+40}\end{array}\right.$ | C. | $\left\{\begin{array}{l}{3x=4y}\\{x=2y+40}\end{array}\right.$ | D. | $\left\{\begin{array}{l}{3x=4y}\\{x=2y-40}\end{array}\right.$ |
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