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y - y1 = m(x - x1)
y - (-9) = -3/5(x - (-1))
y + 9 = -3/5(x + 1)
------------------------------- x 5
5y + 45 = -3(x + 1)
5y + 45 = -3x - 3
5y + 3x + 45 + 3 = 0
3x + 5y + 48 = 0