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Algebra II Recipe: Variation
A. Definitions
  1. Direct Variation - x and y show direct variation if y = kx and k ≠ 0.
  2. Inverse Variation - x and y show inverse variation if y = (k/x) and k ≠ 0.
  3. Joint Variation - z varies jointly with x and y if z = kxy and k ≠ 0.
b varies directly with a.
b varies inversely with a.
c varies jointly with a and b.
b varies inversely with the cube of a.
c varies directly with a and inversely with b.

G Redden

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