AlgebraLab

Algebra II Recipe: Variation

By G Redden

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.
Write an equation for the given relationship.
1.
b varies directly with a.
2.
b varies inversely with a.
3.
c varies jointly with a and b.
4.
b varies inversely with the cube of a.
5.
c varies directly with a and inversely with b.