問題詳情
9. 在早餐店裡，王伯伯買5 顆饅頭，3顆包子，老闆少拿2元，只要50元。李太太買11顆饅頭，5顆包子，老闆以售價的九折優待，只要90元。若饅頭每顆x元，包子每顆y元，則下列哪一個二元一次聯立方程式可表示題目中的數量關係？
(A) 
(B) 
(C) 
(D) 
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