# NCERT Class 11 Mathematics Solutions: Chapter 10 – Straight Lines Miscellaneous Exercise 10 Part 10 (For CBSE, ICSE, IAS, NET, NRA 2022)

Get unlimited access to the best preparation resource for IMO : fully solved questions with step-by-step explanation- practice your way to success.

1. If the lines are equally inclined to the line , find the value of .

Answer:

The equations of the given lines are

… eq (1)

… eq (2)

… eq (3)

Slope of line

Slope of line

Slope of line

It is given that lines (1) and (2) are equally inclined to line (3) .

This means that the angle between lines (1) and (3) equals the angle between lines (2) and (3) .

Or

If then

, which is not real.

Hence, this case is not possible.

If , then

So, the required value of is