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x in (-oo:+oo)
y+1 = (-3/4)*(x-9) // - (-3/4)*(x-9)
y-((-3/4)*(x-9))+1 = 0
(3/4)*(x-9)+y+1 = 0
3/4*(x-9)+y+1 = 0
3/4*(x-9)+y+1 = 0
3/4*x+y-27/4+1 = 0
3/4*x+y-23/4 = 0
3/4*x+y-23/4 = 0
3/4*x+y-23/4 = 0 // - y-23/4
3/4*x = -(y-23/4) // : 3/4
x = (-(y-23/4))/3/4
x = 4/3*(23/4-y)
x = 4/3*(23/4-y)
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