# Chapter 10 Straight Lines Class 11 Maths Lecture 6

“Take up one idea. Make that one idea your life–think of it, dream of it, live on that idea. Let the brain, muscles, nerves, every part of your body, be full of that idea, and just leave every other idea alone. This is the way to success.” —Swami Vivekananda

# Lecture - 6 Chapter 10 Straight Lines

DERIVATIONS OF FORMULAS TO FIND EQUATION OF STRAIGHT LINES

Two-point form

 NCERT EXERCISE 10.2

Question 7. Passing through the points (–1, 1) and (2, – 4).

Slope intercept form and meaning of intercept

Question 5. (using Slope intercept form) Intersecting the x-axis at a distance of 3 units to the left of origin with slope –2.

Question 6. (using Slope intercept form) Intersecting the y-axis at a distance of 2 units above the origin and making an angle of 30 with positive direction of the x-axis.

Intercept form

Normal Form of Straight Line

Question 8. (using Normal Form) Perpendicular distance from the origin is 5 units and the angle made by the perpendicular with the positive x-axis is 30.