Two variables x and y are such that y varies directly as x^{n} where n is a constant. Given that y = 320 when r=16 and y =2560 when x = 64, find the value of n

y = cx^{n}c = 320 = 256 16^{n} 64^{n}2 ^{4n }= 32 2^{6n} 2562^{−2n} = 2^{−3}n = 1.5

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