Let line L:(x-1)/(2)=(y+1)/(-1)=(z-2)/(0...

Let line `L:(x-1)/(2)=(y+1)/(-1)=(z-2)/(0)` meets the plane `Pi_(1):2x+y+z=9` at `"P"` and plane `Pi_(2):y=0` at Q and image of `"Q"` in the plane `Pi_(1)` ,is R .If the area of triangle `PQR` ,is equal to `(p)/(q)sqrt(21)` then find the value of `(p-q)`

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