one fable-low hijack cell
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English with pipe '|' — '{X} | {Y}'
verdictpicked linear (first-offered)
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# Nonlinear vs. Linear
## Linear
A system, equation, or relationship is **linear** if it satisfies:
- **Additivity:** f(x + y) = f(x) + f(y)
- **Homogeneity (scaling):** f(ax) = a·f(x)
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