SAT Math Multiple Choice Question 109: Answer and Explanation
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4. If x + y = 0, which of the following must be equivalent to x - y ?
- A. -2y
- C. x
- D. x2
Correct Answer: A
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).