That's what additive inverse means. The additive inverse of a number is another number, so that when you add them together you get zero.
You can find the other examples.
wut do u mean exactly hey maybe try the um wut it called the store!!!
I wouldn't say justify is an accurate choice of words. Support is more like it. In fact additive inverses are defined this way. Anyway 1 + (-1) 0 . 4 + (-4) 0