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    Why in the chapter dealing with transformations of a graph do we substitute y for f(x)?
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    (Original post by tryingtomaths)
    Why in the chapter dealing with transformations of a graph do we substitute y for f(x)?
    It's easier to use functional notation when looking at transformations.

    Say you have a function y=x^2 and you have a transformation that transforms it into y'=(x+2)^2, you can merely write it as f(x+2). When it's in that form, you can use rules you've already learnt to complete a sketch. There is not equivalent y-based notation.
 
 
 
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