Answer:
Tu y yo estamos en Bolivia.
Step-by-step explanation:
(Sorry in advance for the lack of accent marks)
Tu y yo = you and me. This is also known as "we", or nosotros.
So, if we reread the sentence as Nosotros ___ en Bolivia, we can conjugate estar. In this case, the present tense conjugation for estar would be estamos.
Hope this helps!