bulk delete in entity framework

I'd like to bulk delete records from a table using linq. There's a post that describes how to do it: Bulk-deleting in LINQ to Entities

var query = from c in ctx.Customers
            where c.SalesPerson.Email == "..."
            select c;

query.Delete();

But the function "Delete" doesn't exist in my var variable.
Furthermore, the function "SubmitChanges" doesn't exist on my context.