Site Title and Slogan in the title tag instead of Page Title

At the homepage, how do I change the title tag to show the Site Title and the Site Slogan instead of the Page Title?

Here is an example: http://www.multivisual.com.br/

• This topic was modified 12 years, 2 months ago by Renato Borges.
• This topic was modified 12 years, 2 months ago by Renato Borges.
• This topic was modified 12 years, 2 months ago by Renato Borges.