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x in (-oo:+oo)
y-4 = (5/4)*(x-(-8*1)) // - (5/4)*(x-(-8*1))
y-((5/4)*(x-(-8*1)))-4 = 0
(-5/4)*(x+8)+y-4 = 0
y-5/4*(x+8)-4 = 0
y-5/4*(x+8)-4 = 0
y-5/4*x-10-4 = 0
y-5/4*x-14 = 0
y-5/4*x-14 = 0
y-5/4*x-14 = 0 // - y-14
-5/4*x = -(y-14) // : -5/4
x = (-(y-14))/(-5/4)
x = -4/5*(14-y)
x = -4/5*(14-y)
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