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•Tegak lurus = m1.m2= -1
-1/2 . M2=-1
M2 = -1 . 2/-1
M2= 2
• (2,0)
X1= 2 ; y1=0
•y-y1 = m(x-x1)
Y-0 = 2 (x-2)
Y = 2x -4 (C)