A formal argument states a position on a substantive topic and then supports that position with

The purpose of a formal argument is to:

It makes a strong argument and you are likely to listen when a person clearly states her position.

It makes a strong argument and you are likely to listen when a person is older than you.

It makes a strong argument and you are likely to listen when a person gives clear reasons for their views.

It makes a strong argument and you are likely to listen when a person admits that your point of view makes sense.

It makes a strong argument and you are likely to listen when a person calls you dude.

It makes a strong argument and you are likely to listen when a person gives you specific examples.

It makes a strong argument and you are likely to listen when a person yells or writes in capital letters.

It makes a strong argument and you are likely to listen when a person shows an understanding of the issue.