Question

How do you say “how are you?” to someone who you don’t know very well???

Answer 1

How are you=Comment allez-vous

Answer 2

Bonjour !!

To someone you don't know very well, you must use the "vous de politesse" which is a "formal you"

Comment allez-vous ?

OR

Vous allez bien ?

-

if it was to someone you know well, as a friend, you'd say

Comment vas-tu ?

OR

Tu vas bien ?

Hope this helps ☺☺☺