Answer:
In the example question you mentioned below (Y vos, ¿Cómo estás?), it means "tú".
Explanation:
The pronoun 'vos' begins to be used from the fourth century and is related to the deal with the emperor.
Its use would have two causes.
On the one hand, at that time there were two emperors that emerged from the division of the Roman Empire and to refer to them in an inclusive way, the use of the 'vos' was introduced.
And on the other hand, the 'vos' emerged as a response to the 'us', a term used by the Roman emperor himself to refer to himself as a representative of power and leader of the empire
