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nanti persamaannya menjadi y = 3x -8
m1 (gradien) = 3
karena tegak lurus, m2 = -1/3
masukkan persamaan ke titik (0,4)
y - y1 = m (x-x1)
y - 4 = -1/3 (x - 0)
y = -1/3x + 4
3y = -x + 12
maaf kalo salah
semoga membantu