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y - 4 = 4/5 ( x - (-15))
5y - 20 = 4x + 60
5y - 4x - 80 = 0
y - y1 = m(x-x1)
y - 4 = 4/5 (x - (-15) )
y - 4 = 4/5 (x + 15)
y - 4 = 4/5 x + 12
5y - 20 = 4x + 60
5y = 4x + 60 + 20
5y = 4x + 80
5y - 4x - 80 = 0