Page 2: Advanced Concepts and Relationships Between Lines
This page delves into more complex topics related to lines in the Cartesian plane. It begins by discussing the equation of a line passing through two points and introduces the concept of a proper bundle of lines.
Vocabulary: A proper bundle of lines refers to a set of lines that all pass through a common point.
The page covers important relationships between lines, such as perpendicularity and parallelism. It provides formulas for determining these relationships based on the slopes of the lines.
Definition: Two lines are perpendicular if and only if the product of their slopes is -1 (m₁ · m₂ = -1).
The distance formula from a point to a line is presented, along with a brief explanation of its derivation. This formula is crucial for various geometric problems and applications.
Example: The distance d from a point (x₀, y₀) to a line ax + by + c = 0 is given by the formula: d = |ax₀ + by₀ + c| / √(a² + b²)
The page concludes with a geometric interpretation of systems of linear equations, explaining how different types of solutions (determined, undetermined, or impossible) correspond to different geometric relationships between lines.
Highlight: The geometric interpretation of a system of linear equations provides a visual understanding of algebraic solutions, linking algebra and geometry.