Draw a Line Through Two Points: Practice and Formative Check

This example demonstrates how to plot a line on the coordinate plane by locating two points, then uses a formative assessment style interaction to help learners practice accurate graphing. The key mathematical ideas are the equation of a line, the meaning of a linear function’s graph, and coordinate geometry’s fact that two distinct points determine a unique line. Construction-wise, the GeoGebra setup relies on the Line command to create the line object, driven by selected point objects such as a, A, and B. The interaction components button1 and text1/text2 provide guided prompts and feedback during the two-point selection process. It is well suited for middle-school algebra and early coordinate-geometry lessons, as well as classroom practice or self-checking homework.