You can delete a slide from any view. To delete a slide, perform the following steps:
Select the slide you want to delete. You can delete multiple slides by selecting more than one slide (on the Outline or Slides pane or in the Slide Sorter view).
Choose the Edit menu, and then choose Delete Slide . The slide is removed from the presentation.
Use the Delete Key You can quickly delete slides by selecting the slide or slides and then pressing the Delete key on the keyboard.
Oops! If you deleted a slide by mistake, you can get it back. Select Edit , Undo , or press Ctrl+Z . This works only if you do it immediately. You cannot undo the change if you exit PowerPoint and restart the application.