Substituting these values into the inequality gives you $\displaystyle{3}{\left({4}\right)}-{4}{\left(-{3}\right)}<{12}\usepackage{cmbright}\Huge\$ , or $\displaystyle{12}+{12}<{12}\usepackage{cmbright}\Huge\$ . Since $\displaystyle{24}<{12}\usepackage{cmbright}\Huge\$ is a false statement, $\displaystyle{\left({4},-{3}\right)}\usepackage{cmbright}\Huge\$ is not a solution.