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y = x/3 -8/3
Gradien = 1/3
Karena tegak lurus
m.1/3 = -1
m = -1 : 1/3
= -1 x 3 = -3
Persamaan garis
y = -3x + b
Subtitusi titik (3,-1)
-1 = -3(3) + b
-1 = -9 + b
-9 + b = -1
b = -1 + 9
= 8
Jadi y = -3x + 8