see please below
As usual,"you" means several things.
1)if you means one single man, then assalaam alayka
2)if you means one single woman, then assalaam alayki
3)if you means two men or two women, then assalaam alaykumaa
4) if you means several men, then assalaam alaykum
5) if you means several women, then assalaam alakunna
These are the main solutions.
I give only more precision to what Fuad said before which was not wrong
I hope it helps you
Local time: 20:00
Native speaker of: Arabic, French
PRO pts in pair: 51