To animate a line graph in PowerPoint, you need to open the slide, draw the Graph add the labels and then animate the graph as explained here.

Learn how to add & use the Draw tab in PowerPoint. It consists of drawing tools to draw on your slide. Make sketches with pen, pencil, and highlighters, etc.

How to Use Graph Callouts in PowerPoint. Microsoft PowerPoint presentations enable you to show a large amount of information in easily digestible portions. A callout is a way to highlight an area ...