You just write, "No Solution."
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Parallel
A linear equation in two variables will not have a single solution. Its solution set is a line in the Cartesian plane. The solution to non-linear equations will depend on the equation.
If the two equations are linear transformations of one another they have the same solution.
One
It means that whatever you have substituted is the solution of the given linear equation. Or you have substituted the equation in itself.