# Lecture 10 Chapter 10 Straight Lines Class 11 Maths

“Success is walking from failure to failure with no loss of enthusiasm.” —Winston Churchill

# Lecture - 10 Chapter 10 Straight Lines

Derivation for Distance between a point and a straight line

 NCERT EXERCISE 10.3

Question 4. Find the distance of the point (–1, 1) from the line 12(x + 6) = 5(y – 2).

How check lines are parallel through their equations

Derivation for Distance between two parallel lines

Question 5. Find the points on the x-axis, whose distances from the line $$\frac{x}{3}+\frac{y}{4}=1$$ are 4 units.

Question 6. Find the distance between parallel lines
(i) 15x + 8y – 34 = 0 and 15x + 8y + 31 = 0
(ii) l (x + y) + p = 0 and l (x + y) – r = 0.