This kind of chart is called a line graph. A line graph works the same way that a bar graph works, it just looks different. For some applications, line graphs can make your data look more exciting and dramatic, as it does with Mrs. Johnson's profits.
Height of Plant after applying SuperGro Fertilizer
Day 1: height = 2 cm
Day 2: height = 5 cm
Day 3: height = 8 cm
Day 4: height = 9 cm
Day 5: height = 10 cm
Starting with Day 1, click on the point on the graph that corresponds to Day 1 = 2 cm (Hint: Watch for the pointing finger!)

We're going to put this data into the graph:
Now click on the spot that corresponds to Day 2 = 5 cm.
Now click on the spot which corresponds to Day 3 = 8 cm