It would be positive 1/3 because if you move to the right one on your bottom point and up 3 it gives you +1/3
Line graphs (or line charts) are best when you want to show how the value of something changes over time, or compare how several things change over time relative to each other. Whenever you hear that key phrase “over time,” that's your clue to consider using a line graph for your data.
-BBBM
