I am looking for help to run a Join Query to find all out Accounts in our Database without Contacts AND Opportuntiy.  I can run the query indepetly, but I would like to join the queries. 

The Query I am runing to find Accounts without Contacts: Select Id, Name From Account Where Id NOT IN (SELECT AccountId FROM Contacts)
Query to find Accounts without Opportunties: Select Id, Name From Account Where Id NOT IN (SELECT AccountId FROM Opportunity)