SAT Math Multiple Choice Question 109: Answer and Explanation

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Test Information

Question: 109

4. If x + y = 0, which of the following must be equivalent to x - y ?

  • A. -2y
  • B.
  • C. x
  • D. x2

Correct Answer: A

Explanation:

A If x + y = 0, then x = -y. Using this relationship and substituting into the expression x - y, we find that x - y = -y - y = -2y. This is (A).

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