JEE Main 2019 Mathematics question
If the two lines x + (a − 1)y = 1 and (a ∈ R − {0, 1}) are perpendicular, then the distance of their point of intersection from the origin is:
Answer: (B)
Solution
⇒ a = −1; lines x − 2y = 1 and 2x + y = 1 meet at (3/5, −1/5); distance .