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m = -5-(-1) / 1-7 = -4/-6 = 2/3
karena sejajar maka gradien sama = ⅔
persamaan garis g
y - 9 = ⅔ (x - 8)
y - 9 = ⅔x - 16/3
y = ⅔x - 16/3 + 9
————————— (×3)
3y = 2x - 16 + 27
3y = 2x + 11
atau
2x - 3y + 11 = 0