Depends. If you just created it on the phone, not using any special app but the phone itself, it probably won't send as a slideshow. They are not designed to work that way.
However, there are apps out there (if you didn't use one) that will help you create a slideshow that actually can be sent to others. If you used one of those to create it, then you just need to attach the slideshow to an email like any other file (they will probably have to download it to see it). If you haven't installed one of those apps to make it with, then I would suggest taking that route.