When given two names (variable expressions) for the same quantity, you can use algebra to solve the equation.
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You will obtain a more accurate answer than is possible using graphical methods. It's faster and less work than using a table.
Its harder to solve the equations with grande numbers
Equations = the method
Simultaneous equations can be solved using the elimination method.
The answer depends on whether they are linear, non-linear, differential or other types of equations.