question: private boolean isSolvable ( int method ) throws NullPointerException { if ( solved ) { return solvable ; } if ( ! reducedRowEchelonForm ) { reducedRowEchelonForm ( method ) ; } for ( int i = rank ; i < rhs . length ; i ++ ) { if ( Math . abs ( rhs [ row [ i ] ] ) > DELTA ) { solvable = false ; return false ; } } solvable = true ; return true ; }
target:  Checks solvability of this linear equation system with the chosen method.