You may not have noticed the negative sign of the x-coordinate. Points located in Quadrant I have the pattern ( $\displaystyle+\usepackage{cmbright}\Huge\$ , $\displaystyle+\usepackage{cmbright}\Huge\$ ). You need to find the quadrant with points that have the pattern ( $\displaystyle-,+\usepackage{cmbright}\Huge\$ ).