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A system of circles pass through (2, 3) ...

A system of circles pass through `(2, 3)` and have their centres on the line `x + 2y - 7 = 0.` Show that the chords in which the circles of the system intersects the circle `x^2 + y^2 - 8x + 6y - 9 = 0` are concurrent and also find the point of concurrency.

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