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m1 = -a/b = - 2 / 6 = - 1/3
m1 . m2 = -1
- 1/3 . m2 = -1
m2 = 3
y - y1 = m2 (x - x1)
y - (-2) = 3 (x - (-4))
y + 2 = 3 (x + 4)
y + 2 = 3x + 12
0 = 3x - y + 10
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