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(y - 8) / (-7 - 8) = (x - 7) / (2 - 7)
(y - 8) / (-15) = (x - 7) / (-5)
(-5) (y - 8) = (-15(x - 7)
- 5y + 40 = - 15x + 105
- 5y = - 15x + 105 - 40
- 5y = - 15x + 65
y = 3x - 13
m = 3
y - y1 = m(x - x1)
y - 8 = 3(x - 7)
y - 8 = 3x - 21
y = 3x - 21 + 8
y = 3x - 13