If x + y = 0, which of the following must be equivalent to x - y ?
A. -2y
B.
C. x
D. x2
Answer:A
If x + y = 0, which of the following must be equivalent to x - y ?
A. -2y B. C. x D. x2
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).