Though you correctly substituted the slope (m) into $\displaystyle{y}={m}{x}+{b}\usepackage{cmbright}\Huge\$ , you then substituted the y-value from the ordered pair (1) for b. Instead, you should substitute the coordinates of the point $\displaystyle{\left(-{6},{1}\right)}\usepackage{cmbright}\Huge\$ for x and y in $\displaystyle{y}=\frac{{2}}{{3}}{x}+{b}\usepackage{cmbright}\Huge\$ , and solve for b.