Question

Which expression is equivalent to -1?

A) -
x + y
x - y
B) -
x - y
-x + y
C) -
x - y
-x - y
D) -
x + y
-x + y

Answer 1

Hello,
Answer B

If x≠y then

`(x-y)/(-x+y)=(x-y)/(-(x-y))=-1`