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maka garis yang dicari gradiennya
m x -3 = -1
m = 1/3
melalui titik (0,0)
(y-0)=1/3(x-0)
y=1/3x
y = -3x
m= -3
karena tegak lurus maka
m x -3 = -1
m = 1/3
persamaan garis
y = mx
y = 1/3 x