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x in (-oo:+oo)
y+13 = (11/4)*(x+8) // - (11/4)*(x+8)
y-((11/4)*(x+8))+13 = 0
(-11/4)*(x+8)+y+13 = 0
y-11/4*(x+8)+13 = 0
y-11/4*(x+8)+13 = 0
y-11/4*x-22+13 = 0
y-11/4*x-9 = 0
y-11/4*x-9 = 0
y-11/4*x-9 = 0 // - y-9
-11/4*x = -(y-9) // : -11/4
x = (-(y-9))/(-11/4)
x = -4/11*(9-y)
x = -4/11*(9-y)
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