i have no clue how to do this problem. Given a power function of the form f(x)=ax^n , with f(3)=18 and f(6)=72, find n and a

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f(x)=ax^n , with f(3)=18 and f(6)=72, find n and a Plug in 3 and 6 for x you get a3^n=18 a6^n=72 Solve these simultaneous equations for a and n?