If you move from $\displaystyle{\left(-{5},-{1}\right)}\usepackage{cmbright}\Huge\$ to $\displaystyle{\left(-{2},{1}\right)}\usepackage{cmbright}\Huge\$ , you are going up and to the right, so both the rise and the run are positive. So the slope is positive. The correct answer is $\displaystyle\frac{{2}}{{3}}\usepackage{cmbright}\Huge\$ .