Q. If the straight line $ax + by + c = 0$ always passes through $(1,\ - 2)$, then $a,\ b,\ c$ are
A) in AP
B) in HP
C) in GP
D) None of these
Explanation
(a)
Since, $ax + by + c = 0$ is always passes through $(1,\ - 2)$
$\therefore a - 2b + c = 0$
$\Rightarrow 2b = a + c$
Therefore, $a,\ b$ and $c$ are in AP
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.