What is the y-intercept (b) of a line that is perpendicular to $\displaystyle{y}={6}{x}-{2}\usepackage{cmbright}\Huge\$ and contains the point $\displaystyle{\left(-{18},{10}\right)}\usepackage{cmbright}\Huge\$ ?

The y-intercept $\displaystyle{b}=\usepackage{cmbright}\Huge\$ _____.