About placements...

So, my placements went horribly, this is my first ranked season ever and I get this: 2 wins and 8 losses. Every teammate just had terrible luck, every game. So, me and friend were surprised we both got placed Silver V after this, satisfied (that we didn't get bronze) we just mind our own business and start playing normals again. Now I keep getting messages on how I managed to get to Silver V with just 2 wins. so, how did I get to Silver with only 2 wins? My scores aren't anything to write home about either. Is it calculated by score/playstyle etc. or purily win/lose?
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