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Please solve and tell working!!! :C

Given that \(y=ax^{n}-23 \), and that \(y=4 \) when \(x=3 \) and \(y=220 \) when \(x=9 \), find the value of \(a \) and of \(n \).

Given that \(y=ax^{n}-23 \), and that \(y=4 \) when \(x=3 \) and \(y=220 \) when \(x=9 \), find the value of \(a \) and of \(n \).

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