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From point P on the circle x^2-y^2- 2x +...

From point P on the circle `x^2-y^2- 2x + 6y-8= 0`. tangents `PA and PB` are drawn to the circle `x^2+y^2 - 2x + 6y +1 = 0`, then the locus of orthocentre of `DeltaPAB` is `x^2 + y^2 + ax + by + c = 0`, where `(a+b-c)` is equal to -

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