Answer:
in Slide Sorter view, selecting Slide 11 and then right-clicking on it and choosing Delete Slide
Explanation:
In order to delete an slide from power point or other presentation software, you just have to right-click on the slide on the slide sorter view and choose delete from with left-click, that is all you have to do to eliminate the Slide, and then the subsequent slides are re-arranged to cover the number of slides, andif you erase the 11, the 12 would become the 11 and the same with the slides that come after.