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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-64/9-4 = 0
y-8/9*x-100/9 = 0
y-8/9*x-100/9 = 0
y-8/9*x-100/9 = 0 // - y-100/9
-8/9*x = -(y-100/9) // : -8/9
x = (-(y-100/9))/(-8/9)
x = -9/8*(100/9-y)
x = -9/8*(100/9-y)
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