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ax+by+c=0
m=-a/b =-4/3
gradien sejajar : m=m1 = -4/3
prs grs mll ttk (3,-11) dgn x1=3, y1=-11, m1=-4/3
y-y1 = m1(x-x1)
y-(-11) = -4/3(x-3)
y+11=-4/3x+4
y=-4/3x+4-11
y=-4/3x-7
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