Students learn how to model non-linear direct proportion functions using formulae and graphs. Learning progresses from deriving the equation to manipulating it to calculate missing values.

**Differentiated Learning Objective**s

- All students should be able to calculate the constant of variation that models how two measurements are in direct proportion.
- Most students should be able to derive and use the formula that models how two measurements are in direct proportion.
- Some students should be able to model how two measurements are in nonlinear direct proportion using a formula and graph.

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