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x in (-oo:+oo)
y-4 = (5/9)*(x-4) // - (5/9)*(x-4)
y-((5/9)*(x-4))-4 = 0
(-5/9)*(x-4)+y-4 = 0
y-5/9*(x-4)-4 = 0
y-5/9*(x-4)-4 = 0
y-5/9*x-4+20/9 = 0
y-5/9*x-16/9 = 0
y-5/9*x-16/9 = 0
y-5/9*x-16/9 = 0 // - y-16/9
-5/9*x = -(y-16/9) // : -5/9
x = (-(y-16/9))/(-5/9)
x = -9/5*(16/9-y)
x = -9/5*(16/9-y)
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