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a = -2
b = 7
Persamaannya:
y - b = m(x - a)
y - 7 = -4(x + 2)
4x + y + 1 = 0
y' = -4 => m = y' (x)
m = -4
y-y1 = m (x-x1)
y - 7 = (-4) (x-(-2))
y - 7 = -4x - 8
y = -4x - 1