very possible, unless there is something preventing them from being true, like an undefined answer. The most common ways are through substitution, graphing, and elimination.
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Yes, that is often possible. It depends on the equation, of course - some equations have no solutions.
It may be possible to solve equations. Expressions cannot be solved until they are converted, with additional information, into equations or inequalities which may have solutions.
The answer depends on the nature of the equations.
One can solve equations of motion by graph by taking readings of the point of interception.