exam Maths Puzzle Numerical Ability

What is the transformational form of the quadratic function described by the mapping rule (x,y)-- (x+2,3/4y-3) ?

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Please help to solve this question:

(1/4) + (1/x) = (1/5) - (3/x)

Also what is x?
A man invests part of $6,000 at 4% interest and the rest at 3% interest. His total annual income is $225. How much has he invested at each rate?