To be parallel to the line $\displaystyle{y}={3}{x}+{5}\usepackage{cmbright}\Huge\$ , a line's slope must be 3. The slope of the line represented by $\displaystyle{y}+{1}=-{3}{\left({x}-{2}\right)}\usepackage{cmbright}\Huge\$ is $\displaystyle-{3}\usepackage{cmbright}\Huge\$ .