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.

For Microsoft Excel to PowerPoint: In Excel, select the graph you want to include in your presentation. Right-click it and select Copy. Open your PowerPoint and head to the desired slide.

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 ...