\( \definecolor{colordef}{RGB}{249,49,84} \definecolor{colorprop}{RGB}{18,102,241} \)
Let \(f\) be the function defined on \(\mathbb{R}\) by \(f(x) = e^{-5x}\).
Show that \(f\) is a solution to the first-order differential equation:$$ y' + 5y = 0 $$
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