You may have made a mistake in addition. Remember that to add numbers with different signs, you take the difference of their absolute values and give the difference the same sign as the addend with the greater absolute value.

$\displaystyle-{3}={1}+{\left(-{4}\right)}\usepackage{cmbright}\Huge\$ or $\displaystyle-{3}=-{3}\usepackage{cmbright}\Huge\$

The statement is true, so the ordered pair $\displaystyle{\left(-{4},-{3}\right)}\usepackage{cmbright}\Huge\$ is a solution to the equation.