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Verified Answer :

y=21 because 3/21=7 and 7*3=21 so Y=21

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Direct variation:
\(y=kx\)

y=49 when x=7.
\(49=7k \\ k=\frac{49}{7} \\ k=7\)

y=? when x=3.
\(y=7 \times 3 \\ y=21\)

y=21 when x=3.

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