Graph Linearizing

When data sets are more or less linear, it makes it easy to identify and understand the relationship between variables. You can eyeball a line, or use some line of best fit to make the model between variables. 

When you are faced with data sets that need a nonlinear model, you have at least two choices: 
  1. make a model that itself is nonlinear, or 
  2. transform the data so that they are linear, and use those easy linear techniques.@ 
Let's talk about this second option, linearizing. What does it mean to transform the data so that they are linear?