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10 The points A, B and C have coordinates A(2, 8), B(9, 7) and C(k, k-2).
a Given that AB = BC, show that a possible value of k is 4 and find the other possible value of k.
4, find the equation of the line that bisects angle ABC.
b For the case where k = 4, find the equation of the line that bisects angle ABC