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What is the purpose of a line graph?

  1. To show a specific quantity

  2. To compare different categories

  3. To show trends over a period of time

  4. To categorize data

The correct answer is: To show trends over a period of time

A line graph is specifically designed to show trends over a period of time by plotting data points on a two-dimensional graph where the x-axis typically represents time intervals and the y-axis represents the variable being measured. This allows viewers to easily observe fluctuations, patterns, and relationships in the data as time progresses. While other types of graphs may be used to display specific quantities, compare categories, or categorize data, they do not capture the continuous nature of changes over time as effectively as a line graph does. This unique capability makes line graphs particularly useful in various contexts, such as tracking changes in temperature, stock prices, or population growth, thereby providing a clearer understanding of how variables interact over time.