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The least value of y is cube root 3
![21 {y}^{3} \\ \\ put \: y = \sqrt[3]{3} \\ \\ = 21 \times { (\sqrt[3]{3} )}^{3} \\ \\ = 21 \times 3 \\ \\ = 63](https://tex.z-dn.net/?f=21+%7By%7D%5E%7B3%7D+%5C%5C+%5C%5C+put+%5C%3A+y+%3D+%5Csqrt%5B3%5D%7B3%7D+%5C%5C+%5C%5C+%3D+21+%5Ctimes+%7B+%28%5Csqrt%5B3%5D%7B3%7D+%29%7D%5E%7B3%7D+%5C%5C+%5C%5C+%3D+21+%5Ctimes+3+%5C%5C+%5C%5C+%3D+63 "21 {y}^{3} \\ \\ put \: y = \sqrt[3]{3} \\ \\ = 21 \times { (\sqrt[3]{3} )}^{3} \\ \\ = 21 \times 3 \\ \\ = 63")
And 63 is multiple of 9
And 63 is multiple of 9
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