First, you probably wrote the slope as $\displaystyle\frac{{{r}{u}{n}}}{{{r}{i}{s}{e}}}\usepackage{cmbright}\Huge\$ instead of $\displaystyle\frac{{{r}{i}{s}{e}}}{{{r}{u}{n}}}\usepackage{cmbright}\Huge\$ . Second, if you move from $\displaystyle{\left(-{5},-{1}\right)}\usepackage{cmbright}\Huge\$ to $\displaystyle{\left(-{2},{1}\right)}\usepackage{cmbright}\Huge\$ , both the rise and the run are positive. So the slope is positive. The correct answer is $\displaystyle\frac{{2}}{{3}}\usepackage{cmbright}\Huge\$ .