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18-05-2015
Mathematics

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Inverse function of f(x) =0.2x+1

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18-05-2015

[tex]y=0.2x+1 \\ \\ \hbox{solve for x:} \\ y=0.2x+1 \ \ \ |-1 \\ y-1=0.2x \ \ \ |\times 5 \\ 5y-5=x \\ x=5y-5 \\ \\ \hbox{switch x and y:} \\ y=5x-5 \\ \\ \boxed{f^{-1}(x)=5x-5}[/tex]

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