Lessons in this chapter
- 1Slope and Relationships Between LinesConnect coordinate geometry to the direction of a line, then use slope to explain parallelism, perpendicularity and angles.
- 2Equations of Straight LinesBuild line equations from points, slopes and intercepts, and choose a form that matches the information given.
- 3Distances from Points and Between LinesDerive perpendicular distance and connect it to parallel-line separation, perpendicular feet and triangle altitudes.
- 4Geometric Applications of Line EquationsCombine slopes, intersections, midpoint conditions and distances to reason about reflections, areas, loci and routes.
- 5Chapter Summary and PracticeConnect the whole chapter through a method-selection guide, mixed worked examples and reasoning checks.