Question
If $x = 5y,$ then $x$ and $y$ vary ________with each other.

Answer

If $x = 5y,$ then $x$ and $y$ vary directly with each other.
solution:
Given, $x = 5y$
Then,$\frac{\text{x}}{\text{y}}=\frac{5}{1}=\text{k}$(constany) $x$ and $y$ vary directly with each other.

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