If three lines whose equations are y m1x c1 y m2x c2 and y m3x c3 are concurrent then show...........

If three lines whose equations are y = m1x + c1, y = m2x + c2 and y = m3x + c3 are concurrent, then show that m1 (c2 – c3) + m2 (c3 – c1) + m3 (c1 – c2) = 0. (5 marks)

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