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ML1= Y2-Y1 : X2-X1 = 9-3 : 5-5 = 6 : 0 = tdk terdefinisikan
l2 = x1 4 y1 2 x2 0 y2 2
ml2= y2-y1 : x2-x1 = 2-2 : 0-4= 0 - (-4) = 0
brarti itu tidak garis tegak lurus..
*kalo ga slah+kalo rumusny ga kebalik