Answer:

1.

•The Title-The title offer a short explanation of what is in your graph.

•The Legends-The legend tells what each line represent.

•The Source-The source explains where you found the information that is in your graph.

•Y-Axis

•The Data

•X-Axis

2.Line graphs are useful in that the show data variables and trends very clearly and can help to make predictions about the result of data not yet recorded.They can also be use to display several dependent variable against one independent variable.

3.Thw horizontal label across the bottom and the vertical label along the side tells us what kinds of data is being shown.The horizontal scale across the bottom and te vertical scale along the side tells us how much or how many.The points r dots on the graphs represents the x,y coordinates or ordered pairs.