An "inconsistent" set of equations. If they are all linear equations then the matrix of coefficients is singular.
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The null interval is the best that I can see!
If you mean: 3-(-5) then the solution is 8 because -(-5) = plus 5
which measure best describes the data set
The solution to a system of inequalities is where the solutions to each of the individual inequalities intersect. When given a set of graphs look for the one which most closely represents the intersection, this one will contain the most of the solution to the the system but the least extra.
Determining the volume is the situation that describes a cubic unit.