[size=200]Is -(x+y) = -x-y ?[br][br]Answer the following :[br](a) If x and y are substituted with different values as shown above and the expression on the left of "=" and expression on the right are evaluated, do they have the same result?[br][br](b) If yes, can we say that -(x+y) = -x-y ?[/size]
[size=200](a) Yes[br][br](b) Yes, since the left side is always equal to the right when x and y are substituted, then[br] -(x+y) = -x-y[/size]