You correctly recognized that the solution does include $\displaystyle-{6}\usepackage{cmbright}\Huge\$ , but the points on the graph are to the left, so they represent numbers that are less than $\displaystyle-{6}\usepackage{cmbright}\Huge\$ . The correct answer is $\displaystyle{x}\le-{6}\usepackage{cmbright}\Huge\$ .