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x in (-oo:+oo)
Y-9 = (1/9)*(x-8) // - (1/9)*(x-8)
Y-((1/9)*(x-8))-9 = 0
(-1/9)*(x-8)+Y-9 = 0
Y-1/9*(x-8)-9 = 0
Y-1/9*(x-8)-9 = 0
Y-1/9*x-9+8/9 = 0
Y-1/9*x-73/9 = 0
Y-1/9*x-73/9 = 0
Y-1/9*x-73/9 = 0 // - Y-73/9
-1/9*x = -(Y-73/9) // : -1/9
x = (-(Y-73/9))/(-1/9)
x = -9*(73/9-Y)
x = -9*(73/9-Y)
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