By the substitution method
By the elimination method
By plotting them on a graph
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The pair of equations have one ordered pair that is a solution to both equations. If graphed the two lines will cross once.
Presumably the question concerned a PAIR of linear equations! The answer is two straight lines intersecting at the point whose coordinates are the unique solution.
So, take the case of two parallel lines, there is no solution at all. Now look at two equations that represent the same line, they have an infinite number of solutions. The solution is unique if and only if there is a single point of intersection. That point is the solution.
an ordered pair that makes both equations true
Always. Every ordered pair is the solution to infinitely many equations.