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