Is it correct?
and you?

а у теба? (informal)
а у вас? (formal)

Question

Is it correct?
and you?

а у теба? (informal)
а у вас?  (formal)

Answer

That's right. Just a little typo:
А у тебя?

But depending on the situation you can ask the same question in many different ways:
- How are you?
- Great. And you?

- Как дела?
Informal:
- Отлично. А у тебя?/А твои?/Твои как?/Как твои?/Ты как?/Как сам(а)?
Formal:
- Отлично. А у вас?/А ваши?/Ваши как?/Как ваши?/Вы как?

Answer

Usually, if you answered "and you?", you will closer to partner. In Russia, we rarely make question about each other simple for question. 
We usually make more unfurled question. For example:

I have been to sea. What about your weekend?

But not

I have been to sea. And you?

Answer

Превод фразы and you? может иметь несколько значений.

1. А ты?   
    А Вы?
 Например: I'm a doctor. And you?
                  Я доктор. А вы? (polite)  А ты? (informal)

2. А у тебя?
    А у Вас? 
 
Например: I have a bike. And you?
                 У меня есть велосипед. А у вас? (polite)  А у тебя? (informal)

Первый вариант перевода используется чаще, но перевод будет зависить от смысла вопроса.

Answer

а у тебя? (informal)
а у вас? (formal)

Answer

it seems me so
t'u - ты (you)
Usted - Вы (You)
vosotros - вы (you)

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