When creating a line graph you can make it as simple or as complex as you like. Create a line graph with one line and 2 points, or create a graph with up to 4 lines and 31 points. The choice is yours.
Begin by supplying at least one pair of x and y values. You should also provide: a graph title (60 characters maximum) and titles for the x and y axis. Default options are set for (although you can change them): number of points (2-31), number of lines (1-4), min and max values for the x and y axis, line titles (if using more than 1 line), line color, point color, point shape, shape size, graph size (TIP: more points display best in larger graph sizes), background color, and image file type (if you are using an older browser or are having difficulty seeing the image select jpeg).
Just start entering information by filling in the lines and points you need. Be sure to use no more than 7-digit values (between 1 and 9999999) for the best results (decimal points count as a digit).
Click here to fill in a 1-line example using education data from NCES