When $\displaystyle{x}=-{3}\usepackage{cmbright}\Huge\$ and $\displaystyle{y}={4}\usepackage{cmbright}\Huge\$ then $\displaystyle{y}+{3}={7}\usepackage{cmbright}\Huge\$ and $\displaystyle{2}{\left({x}-{4}\right)}=-{14},\usepackage{cmbright}\Huge\$ so $\displaystyle{y}+{3}\ne{2}{\left({x}-{4}\right)}\usepackage{cmbright}\Huge\$ when $\displaystyle{\left({x},{y}\right)}={\left(-{3},{4}\right)}\usepackage{cmbright}\Huge\$ . Therefore (-3, 4) does not lie on the line.