Demo: DataFunction() for piecewise linear function

This example demonstrates how to create piecewise linear functions using GeoGebra's DataFunction() command. The key mathematical concepts involve piecewise functions, linear interpolation, and function definition. Construction steps include sorting data points with Sort, defining points with Point, and using l1 and f commands to build the function expression. Suitable for middle school students learning function concepts or high school students for function graph analysis.