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x in (-oo:+oo)
y-4 = (8/9)*(x-8) // - (8/9)*(x-8)
y-((8/9)*(x-8))-4 = 0
(-8/9)*(x-8)+y-4 = 0
y-8/9*(x-8)-4 = 0
y-8/9*(x-8)-4 = 0
y-8/9*x-4+64/9 = 0
y-8/9*x+28/9 = 0
y-8/9*x+28/9 = 0
y-8/9*x+28/9 = 0 // - y+28/9
-8/9*x = -(y+28/9) // : -8/9
x = (-(y+28/9))/(-8/9)
x = 9/8*(y+28/9)
x = 9/8*(y+28/9)
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