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.

Insert different values and go back and view the line plot on your slide in PowerPoint. Close the Chart in the Excel window when you are satisfied with the result.

Use these methods to import charts from Excel to PPT. You can copy-paste and link data from Excel to PowerPoint using these instructions.

You can insert almost anything in your PowerPoint 2007 -- the presentation software from Microsoft -- presentations, from images and charts to entire tables.