Question: The circles with equations x + y + 6x 10y = 26 and x + y 12x + 4y = k are congruent.

The circles with equations x² + y² + 6x − 10y = 26 and  x² + y² − 12x + 4y = k are congruent.

a) Determine the value of k.

b) Calculate the distance between their centres.

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