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A system of equations is a set of equations with more than one variable dealing with the same material. If there are 2 variables, then the system must have 2 equations before it can be solved. 3 variables need 3 equations, etc.
You don't need ANY factor. To find a unique solution, or a few, you would usually need to have as many equations as you have variables.
At least two - otherwise you have just one equation, not a system.
You need as many equations as you have variables.
An equation with two variables . . . seriously!An equation with one variable can be can be solved, but when there are two variables, you need two equations. This is called a system of two equations in two variables.Three equations in three variables, etc.