Linear Functions: Basic Concepts and Graphing

This example demonstrates the definition of linear functions, their graphical features, and the effects of parameters. It shows the image form of linear functions on the coordinate plane, covering core concepts such as function expressions, slope, and intercepts. Construction points: Use GeoGebra point tools (A, B) to determine line positions, text tools (text1, text2, text3) to label function expressions and key points, and pictures (pic1) to illustrate practical applications. Suitable for middle school mathematics function teaching, particularly for explaining the graphing of linear functions and how parameter changes affect the image.