Correct. The graphed line has slope $\displaystyle-\frac{{1}}{{4}}\usepackage{cmbright}\Huge\$ since it goes through the points (0, 1) and (-4, 2). Any line perpendicular to the graphed line must have slope 4 (the opposite reciprocal of $\displaystyle-\frac{{1}}{{4}}\usepackage{cmbright}\Huge\$ ).