Combination of variations

If $A$ varies as $C$ , and $B$ varies as $C$ , then $A \pm B$ and $A B$ will each vary as $C$ .

~5 minProof · checked by AIvariationproperties

H. S. Hall & S. R. Knight, Higher Algebra (1891) · Ch. III. Variation, Examples III, No. 5

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