Answer:
Given equation of plane is \[-\,2x+y-3z=0\] ?(i) Equation of plane parallel to plane (i) is \[-\,2x+y-3z+\lambda =0\] ?(ii) Since, the plane (ii) passes through the point\[P\,(1,\,\,4,\,\,-\,2)\] \[\therefore \]\[-\,2\,\,(1)+4-3\,\,(-\,2)+\lambda =0\] \[\Rightarrow -\,2+4+6+\lambda =0\] \[\Rightarrow \] \[8+\lambda =0\Rightarrow -\,8\] On putting the value of \[\lambda \] in Eq. (ii), we get \[-\,2x+y-3z-8=0\] \[\Rightarrow \] \[2x-y+3z+8=0\] which is the required equation of the plane.
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