Final answer:
The greeting line of the letter 'Dear Mr. Wilson' follows the proper salutation format of addressing the recipient by their title and last name in a formal letter.
Step-by-step explanation:
The greeting line of the letter Dear Mr. Wilson follows the proper salutation format. In a formal letter, it is important to address the recipient by their title and last name, which in this case would be 'Mr. Wilson'. The salutation is typically followed by a colon (:) and one blank line.