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

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

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

12.  Activity  Groups of 2 to 4  Complete the handout  Supplies  Graph Paper  Scissors  Glue Sticks  Rulers

13.  Reciprocal Function – The parent function of the inverse variation family of curves f(x) = 1/x.

26.  9-1 Inverse Variation Even Problems  9-2 Graphing Inverse Variation Every Third Problem Take a piece (or two) of graph paper if you need it.