Q: does macbook 2009 mirror on apple tv

You would need to export the PowerPoint to keynote and then you can AirPlay it.  However, I am assuming your running mountain lion on the MacBook?  If so you won't be able to AirPlay without a 3rd party app like air parrot

http://www.macworld.com/article/1056988/atv_presentations.html

Use AirPlay to display video from your Mac on an HDTV - Apple Support

http://osxdaily.com/2012/10/03/get-airplay-mirroring-on-older-macs-with-airparro t/

http://www.cultofmac.com/178460/the-real-reason-why-macs-before-2011-cant-use-ai rplay-mirroring-in-mountain-lion-feature…