20. The lines lx + my + n = 0, mx + ny + / = 0 and nx + ly + m = 0 are concurrent if (where l # men
(1) / + m + n = 0
(2) / + m – n = 0
(3) 1 - m + n = 0
(4) 12+ m2 + n2 = Im + mn + nl
3
21. The equation of the line with slope and which is concurrent with the lines 4x + 3y -
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