If you end up with an equation that is always true, such as $\displaystyle{x}={x}\usepackage{cmbright}\Huge\$ , then there are an infinite number of solutions. However, for the system in this question, both equations being true would imply that $\displaystyle{0}={1}\usepackage{cmbright}\Huge\$ . But this is false, which means that you cannot find numbers that make both equations true.