You have learned several methods for solving a system of equations. First, rank the methods in order of preference, noting which
one you would choose to solve a system. Next, describe how to use the method you prefer and give reasons why it is your preferred method. Last, consider your least-preferred method and explain why you placed it at the bottom of your list.
Correlation is what you're looking for. Basically, it means that the two numbers are somehow related. Some examples of correlation would be positive correlation, negative correlation, and no correlation.