Adding to what @joannekwan said --
Most users don't expect several people to be behind one account (unless that's outwardly spoken or it's from the mod team). So if something is posted under your name, they're gonna assume it's from you.
There are some users here that work in groups, but they often
A) have their own separate accounts
B) explicitly state who has control over the account at that time
So if you two are working in a team, you're going to have to figure out how to show that.