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otherwise when you change one or more of the other variables involved you will change the values of the variable you are trying to find
to find the unknown variables
Equations are something you do to make something equal something else to find the missing variables. Algebra is the operations that you perform to find those missing variables.
You can do all the calculations with variables - add the numbers, and divide by the size of the set. Of course, you'll probably end up having variables in the average as well.
The answer depends on what variables the graph shows.