Direct Variation Function – A function that can be modeled with the equation y = kx.

Inverse Variation Function – A function that can be modeled with the equation y = k/x, also xy = k; where k does not equal zero.

Joint Variation – When one quantity varies with respect to two or more variables.

ActivityGroups of 2 to 4Complete the handout

Supplies Graph Paper Scissors Glue Sticks Rulers

Reciprocal Function – The parent function of the inverse variation family of curves

f(x) = 1/x.

9-1 Inverse VariationEven Problems

9-2 Graphing Inverse VariationEvery Third Problem

Take a piece (or two) of graph paper if you need it.