When $\displaystyle{x}=-{4}\usepackage{cmbright}\Huge\$ and $\displaystyle{y}={3}\usepackage{cmbright}\Huge\$ then $\displaystyle{y}+{3}={6}\usepackage{cmbright}\Huge\$ and $\displaystyle{2}{\left({x}-{4}\right)}=-{8},\usepackage{cmbright}\Huge\$ so $\displaystyle{y}+{3}\ne{2}{\left({x}-{4}\right)}\usepackage{cmbright}\Huge\$ when $\displaystyle{\left({x},{y}\right)}={\left(-{4},{3}\right)}\usepackage{cmbright}\Huge\$ and therefore (-4, 3) does not lie on the line.