Question

You (formal/singular) are going to cook.

Tú vas a cocinar.
O Usted va a cocinar.
Ustedes van a cocinar.

Answer 1

Ustedes van a cocinar.

Answer 2

Usted va a cocinar.

Step-by-step explanation:

usted/ustedes is used to be formal, usted being singlular and ustedes being the plural form.