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m = y2-y1/x2-x1
m = 8-(-7)/-3-2
m = 15/-5
m = -3
persamaan garis l yang tegak lurus adalah
y - y1 = - 1/m(x - x1)
y - 1 = -1/-3 (x + 6)
y - 1 = 1/3 (x + 6)
3y - 3 = x + 6
x - 3y + 9 = 0