exam Maths Puzzle Numerical Ability

If g(x) is an inverse of f(x), then how do the ordinate and abscissa coordinates of the points on f(x) map onto coordinates of g(x)?

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can someone please explain how to do this??!?! I dont care for the answers I just want to understand how to deal with this!
thanks in advance..
Determine S20 for the arithmetic s
"Explain in your own words(at least 50 words) why the line x = 4 is a
vertical line?"

I think i know the answer i just have a hard time explaining this can you help me?