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3y = -4x + 5
y = -4/3 x + 5/3 ===> m1 = -4/3
tegak lurus m1.m2 = -1
-4/3.m2 = -1
m2 = 3/4
melalui ( 4, -1) ==> (x1, y1)
persamaan garis :
y - y1 = m(x - x1)
y + 1 = 3/4(x - 4)
y + 1 = 3/4x - 3
y = 3/4x - 4 atau 3x - 4x - 16 = 0...ok?