Variable Expressions with Four Operations

This example demonstrates how moving the red dot up and down the number line causes the blue dot to move correspondingly. Observe and understand the relationship between the positions of the blue and red dots. Core math concepts include addition, subtraction, multiplication, and division. The construction utilizes GeoGebra commands like Sequence, Random, and Point, along with objects such as dots and lists, to create dynamic interactions. Suitable for middle school and above, helping students grasp the geometric meaning of variable expressions and arithmetic operations.