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By the substitution method By the elimination method By plotting them on a graph
There is no simple answer. Sometimes, the nature of one of the equations lends itself to the substitution method but at other times, elimination is better. If they are non-linear equations, and there is an easy substitution then that is the best approach. With linear equations, using the inverse matrix is the fastest method.
Yes, for solving simultaneous equations.
The key to using the elimination method is to find variable terms in two equations that have unequal coefficients