Final answer:
A line graph is the most appropriate graph type to show how real estate prices have changed in the past 5 years.
Step-by-step explanation:
A line graph would be the most appropriate graph type to show how real estate prices have changed in the past 5 years. Line graphs are best used to display trends and changes over time. By plotting the year on the x-axis and the real estate prices on the y-axis, you can easily see how the prices have fluctuated over the years.