Final answer:
A line graph is the best type of graph to represent data that changes and is linked together over time.
Step-by-step explanation:
A line graph is often the most effective format for illustrating a relationship between two variables that are both changing. Line graphs use one or more lines to show how a data point has changed over time. They are commonly used to show trends over a given period. For example, a line graph can be used to represent the change in temperature over a week.