In Spanish, to say ‘and you’ formally, you would say ‘y usted’. The word ‘usted’ is the formal version of ‘you’ that is used in situations where respect or politeness is required.
For example, if you are in a formal setting or speaking to someone you do not know well, you would use ‘y usted’ instead of ‘y tú’, which is the informal way of saying ‘and you’. Using the correct form of address is important in Spanish-speaking cultures, as it reflects the level of respect you have for the person you are speaking to.