Question: How do I fill the area between three equations

I have four equations,

y = 1/x, y=3, y=1, x=0


P1 := plots:-implicitplot(y=1/x, x=-1..2, y=0..4, color=black, scaling=constrained):
P2 := plots:-implicitplot(y=3,   x=-1..2, y=0..4, color=black):
P3 := plots:-implicitplot(y=1,   x=-1..2, y=0..4, color=black):


How do I fill the area between the first three equations and the y axis (x=0)?

Is it possible to do this with plottools:-transform?

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