Multiple Choice Question: What do you call differential equations wherein replacing the independent variable $x$ with $kx$ and the dependent variable $y$ by $ky$ gives the same differential equation? $k$ is a nonzero constant.

What do you call differential equations wherein replacing the independent variable $x$ with $kx$ and the dependent variable $y$ by $ky$ gives the same differential equation? $k$ is a nonzero constant.

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Orphaned Multiple Choice Questions (MCQ) due to changes of exam system.

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