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.

How to Make a Line Plot in PowerPoint. If you need a line chart, Microsoft PowerPoint 2010 can help you plot your line graph on any of the slides that make up your presentation.

How to Draw Moving Lines in PowerPoint. The Microsoft PowerPoint interface does not have a native function to make a moving line, but you can integrate a function using the line and rectangle tool ...