You got this from Odyssey-ware or something because I have the same exact question I don't know if it's right or not and i'm sorry about that but i'm pretty sure this is the right answer.
“Line graphs are useful in that they show data variables and trends very clearly and can help to make predictions about the results of data not yet recorded. They can also be used to display several dependent variables against one independent variable.”
“With a line graph, it is fairly easy to make predictions because line graphs show changes over a period of time. You can look at past performance in a line graph and make a prediction about future performance.”
