exam Maths Puzzle Numerical Ability

"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?

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exam Other Question

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)? simplify and reduce to lowest terms or rationalize

(sqrt)(20m^3b)