Incorrect. If you add the two equations together, you get $\displaystyle{x}+{y}+{\left({x}-{y}\right)}={18}+{14}\usepackage{cmbright}\Huge\$ , which simplifies to $\displaystyle{2}{x}={32}\usepackage{cmbright}\Huge\$ . Notice that the variable y is eliminated. Solve $\displaystyle{2}{x}={32}\usepackage{cmbright}\Huge\$ for x, and substitute the value into either equation to find the value for y.