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x in (-oo:+oo)
y+0 = (-1/9)*(x-4) // - (-1/9)*(x-4)
y-((-1/9)*(x-4))+0 = 0
(1/9)*(x-4)+y = 0
1/9*(x-4)+y = 0
1/9*(x-4)+y = 0
1/9*x+y-4/9 = 0
1/9*x+y-4/9 = 0
1/9*x+y-4/9 = 0 // - y-4/9
1/9*x = -(y-4/9) // : 1/9
x = (-(y-4/9))/1/9
x = 9*(4/9-y)
x = 9*(4/9-y)
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