Q.
If a circle passes through the point of intersection of the coordinates axes with the lines $\lambda x - y + 1 = 0$ and $x - 2y + 3 = 0$, then the value of $\lambda$ is
A) 2
B) 4
C) 6
D) 3
Explanation
(a)
Using the result $a_{1}a_{2} = b_{1}b_{2}$, we get
$\lambda.1 = - 1. - 2$
$\Rightarrow \ \lambda = 2$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.