Show something that's easy for them to digest, and use your comments to provide a little deeper explanation. What have you done thus far, and how are you looking to move forward sooner rather than later?
Who are your customers? Now present a little more detail on your operating plan. The third slide should get to your solution. Create your financial statements and any charts in Microsoft Excel, which is PowerPoint's sister program.
Self -service? You want the audience to relate to the problem or at least understand how it affects others. Add the name of each proposed business owner along with the date.
Personal service? And yes, if you need to go to 12 slides, do so, but try not to go longer. The question is, how do you organize and minimize the breadth of a business plan into a short PowerPoint presentation?