A restaurant has two appetizer specials. Tomato bread costs $5.50, and stuffed mushrooms cost $6.75. The total amount in sales from the two appetizers on a Friday night was $186.75. Which equation can be used to represent x, the number of stuffed mushroom orders and y, the number of tomato bread orders?

Each stuffed mushroom order costs $6.75, and there are x stuffed mushroom orders, so those sales total 6.75x. Each tomato bread order costs $5.50, and there are y tomato bread orders, so those sales total 5.5y. Adding the two amounts gives 6.75x + 5.5y = 186.75, which is choice D.

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