SAT Math Multiple Choice Practice Question 509: Answer and Explanation

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Question: 509

8. If and x > y > 0, then which of the following is equal to ?

A. x + y
B. xy

Correct Answer: D


D Here's yet another chance to plug in because of the variables in the answer choices. In this case, you have several variables. You should start by plugging in values for x and y, and then work out c. Because x > y > 0, let's say x = 6 and y = 3. Therefore, , which equals . The question asks for the value of , which is the reciprocal of , or 2. This is your target answer. If you plug x = 6 and y = 3 into all of the answer choices, you'll find that only D equals 2.

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