Construct a Perpendicular Line Through a Point Not on the Given Line

This example demonstrates how to construct a line perpendicular to a given line through a point not on the line. It involves core mathematical concepts such as perpendicular lines, linear equations, and geometric constructions. The construction uses GeoGebra commands like Line and objects A (point not on the line), X (point on the line), W (foot of the perpendicular), and f (perpendicular line equation). Suitable for high school coordinate geometry instruction and geometric construction practice.