If two quantities $x$ and $y$ vary directly with each other, then ______ of their corresponding values remains constant.

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The explanation to the correct answer.
Compute the required term:
If two quantities $x$ and $y$ vary directly with each other, then the ratio of their corresponding values remains constant.
Two quantities $a$ and $b$ are said to be in direct proportion if they increase or decrease together. In other words, the ratio of their corresponding
values remains constant. This means that
$\frac{a}{b} = k$ where $k$ is a positive number, then the quantities $a$ and $b$ are said to vary directly.
Hence, if two quantities $x$ and $y$ vary directly with each other, then the ratio of their corresponding values remains constant.

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If two quantities x andy vary directly with each other, then ______ of their corresponding values remains constant.

If two quantities $x$ and $y$ vary directly with each other, then ______ of their corresponding values remains constant.