The line $\displaystyle{2}{y}+{x}=-{5}\usepackage{cmbright}\Huge\$ is graphed correctly, but the other line is not. The point of intersection should be the solution to the system, $\displaystyle{\left({1},-{3}\right)}\usepackage{cmbright}\Huge\$ . However, the point of intersection that is pictured is $\displaystyle{\left(-{3},-{1}\right)}\usepackage{cmbright}\Huge\$ .