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(y + 7) / (6 + 7) = (x - 3) / (-4 - 3)
(y + 7) / 13 = (x - 3) / (-7)
(-7) (y + 7) = 13 (x - 3)
- 7y - 49 = 13x - 39
- 7y = 13x - 39 + 49
- 7y = 13x + 10
2) y - y1 = m (x - x1)
y + 6 = - 4(x - 5)
y = - 4x + 20 - 6
y = - 4x + 14