Q. If three planes $P_1 \equiv 2 x+y+z-1=0, P_2 \equiv x-y+z-2=0$ and $P_3 \equiv \alpha x-y+3 z-5=0$ intersects each other at point $P$ on $XOY$ plane and at point $Q$ on $YOZ$ plane, where $O$ is the origin then identify the correct statement(s)?
Vector Algebra
Solution: