exam Maths Puzzle Numerical Ability

how do I graph the given function y=f(x-4)+1

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exam Other Question

Write (2x - 3) /(2x - 1) - 3x as a rational expression. What numbers can not be used for X and Why? Can someone please explain what to do to solve this problem? thanks!

(X^2 - 4)/(9 - x^2)