Incorrect. Find the slope using the given points: $\displaystyle{m}=\frac{{-{7}-{5}}}{{-{1}-{3}}}=\frac{{-{12}}}{{-{4}}}={3}\usepackage{cmbright}\Huge\$

Substitute the slope (m) into $\displaystyle{y}={m}{x}+{b}\usepackage{cmbright}\Huge\$ . Substitute either point for x and y in the equation and solve for b.