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

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.

With the graph options available in Google Sheets, you can make a line, bar, column, pie, or other type of chart in just minutes.

Select all the data you want to have graphed, click on Insert, pick line graph, and choose which one you want. Excel (2007) automagically grouped date and time on the X axis.

Learn about line graphs with this BBC Bitesize Maths article. For students between the ages of 11 and 14.

Learn how to plot coordinates and create straight line graphs to show the relationship between two variables. Also, plot graphs that contain a negative coefficient of x.