multi-step equations
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There are more than two methods, and of these, matrix inversion is probably the easiest for solving systems of linear equations in several unknowns.
Yes you can, if the solution or solutions is/are real. -- Draw the graphs of both equations on the same coordinate space on the same piece of graph paper. -- Any point that's on both graphs, i.e. where they cross, is a solution of the system of equations. -- If both equations are linear, then there can't be more than one such point.
You will obtain a more accurate answer than is possible using graphical methods. It's faster and less work than using a table.
A system of equations means that there are more than one equations. The answer depends on the exact function(s).
There are no disadvantages. There are three main ways to solve linear equations which are: substitution, graphing, and elimination. The method that is most appropriate can be found by looking at the equation.