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 ...

You can change the default color of chart, graph, treemap, etc. in Word, Excel, and PowerPoint with the helpof these simple steps.

The graph is plotted in real time, so whenever you change a value or add a new category, the PowerPoint line graph reflects the changes.