When you are dealing with a number of variables and relations between them.
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When talking about a "system of equations", you would normally expect to have two or more equations. It is quite common to have as many equations as you have variables, so in this case you should have two equations.
The idea is to work with the same variables, but it is possible that some of the variables are missing in some of the equations.
The solution would be the point of intersection of the graphical representation of all equations within the system.
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