Lesson 10 of 15Article18 min
Ch 9 — Straight Lines
Slope measures steepness. Master slope-intercept, point-slope, two-point, intercept, and general form ax + by + c = 0, plus distance from a point to a line.
Slope and forms of a line
Slope measures steepness. Master slope-intercept, point-slope, two-point, intercept, and general form ax + by + c = 0, plus distance from a point to a line.
- Parallel lines: equal slopes; perpendicular: m₁m₂ = −1.
- Angle between lines formula appears in NCERT exercises.
Read this alongside the official NCERT chapter: Straight Lines — https://ncert.nic.in/textbook.php?kemh1=9-16 (full book index: https://ncert.nic.in/textbook.php?kemh1=0-16).