Book Maths Puzzle Algebra

What is the inverse function of:

Y= (x+3)/(x-5)

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Book Other Question

What is the inverse function for:

Y = sqrt(x-9), +5

I have been trying this for hours and all I try I lose the x and y values How do I write an equation for a parabola that crosses the x axis at (1.5, 0) and (4.5,0)?