Let the number of unknowns be N. The solution space may have N, N-1, ..., 0 dimensions or may not exist.
If a solution exists and the dimension of the solution space is 0, then there is exactly one solution,.
If the dimension of the solution space > 0, then there are infinitely many solutions.
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There are three kinds:the equations have a unique solutionthe equations have no solutionthe equations have infinitely many solutions.
Three different kinds: none, one and infinitely many.
The three types of linear equations are: Consistent Dependent, Consistent Independent, and Inconsistent.
There can be linear equations with 1, 2, ... variables. Each of these is different since an equation with n variables belongs to n-dimensional space.
If you mean square feet, you can't convert from one to another. Those measurements, quite simply, measure different kinds of things.