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 Graphs to Put Into PowerPoint. Microsoft PowerPoint enables you to create presentations and slide shows. While a wide variety of text-, image- and object-editing features are available ...

Here is a list of free online Animated Graph and Chart makers to create different types of animated bar charts, line charts, etc. easily.

Clear, informative PowerPoint slides increase the effectiveness of your presentation. A legend helps people understand what you're referring to in a graphic. You can create color-coded legends in ...