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Answer :

[tex]\begin{gathered} y=Kx \\ \text{when x=7, y=28} \\ 28=K(7) \\ K=\frac{28}{7} \\ K=4 \\ y=4x \\ \text{when x=16} \\ y=4\cdot(16) \\ y=64 \\ When\text{ x is 16 the value of y is 64} \end{gathered}[/tex]

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