For which value of $-\mathrm{<mn>9</mn>}$ will the system of inequalities $\left\{\begin{array}{l}{\mathrm{x}}^2-\mathrm{<mn>9</mn>}\mathrm{x}-\mathrm{<mn>12</mn>}\ge 0\\ \mathrm{x}-\mathrm{<mn>4</mn>}>0\end{array}\right.$ have a solution?