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