Question 9
If three lines whose equations are y = m1x + c1, y = m2x + c2 and y = m3x + c3 are concurrent, then show that m1(c2 - c3) + m 2 (c3 - c 1) + m3 (c1 - c 2) = 0.
SOLUTION
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If three lines whose equations are y = m1x + c1, y = m2x + c2 and y = m3x + c3 are concurrent, then show that m1(c2 - c3) + m 2 (c3 - c 1) + m3 (c1 - c 2) = 0.