It's not that simple.
https://support.chess.com/en/articles/8566476-how-do-ratings-work-on-chess-com
About the rating system
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If you have at least played 100 to 200 games, you would find out that in most of the matches you would get 8 points for a win,0 for a draw and lose 8 for a loss.I think 9 for a win, 0 for a draw and -9 for a loss would be better because our rating would switch a even number to a odd number more often which would be better in my opinion.