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gradien garisnya adalah
m = -a/b = -2/5
persamaan garis yang tegak lurus adalah
y - y1 = -1/m(x - x1)
y + 8 = -1/(-2/5) (x + 6)
y + 8 = 5/2(x + 6)
2y + 16 = 5x + 30
2y = 5x + 14
atau
5x - 2y + 14 = 0