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k (4,0)
gradien l
(5-0)/(0-(-3))
5/3
gradien k tegak lurus l =-3/5
persamaan garis k
y-y1=m(x-x1)
y-0=-3/5(x-4)
kali 5(untk menghilangkan pecahan)
5y=3x-12
5y-3x=-12 (D)