literal equations? maybe you mean linear equations? Please edit and resubmit your question if that is what you meant.
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Algebra
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a vetical line has an undifined rate of change
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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.