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x in (-oo:+oo)
y+9 = (4/5)*(x-8) // - (4/5)*(x-8)
y-((4/5)*(x-8))+9 = 0
(-4/5)*(x-8)+y+9 = 0
y-4/5*(x-8)+9 = 0
y-4/5*(x-8)+9 = 0
y-4/5*x+32/5+9 = 0
y-4/5*x+77/5 = 0
y-4/5*x+77/5 = 0
y-4/5*x+77/5 = 0 // - y+77/5
-4/5*x = -(y+77/5) // : -4/5
x = (-(y+77/5))/(-4/5)
x = 5/4*(y+77/5)
x = 5/4*(y+77/5)
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