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cari titik potongnya:
(x-4)² + (y-4)² = 16
(x-4)² + (4-4)² = 16
(x-4)² = 16
x-4 = 4 atau x-4 = -4
x = 8 atau x = 0
saat di titik (8,4):
gradien = ∞
maka persamaan garis: x = 8
saat di titik (0,4):
gradien = ∞
maka persamaan garis: x = 0