Incorrect. Substitute $\displaystyle{1}-{x}\usepackage{cmbright}\Huge\$ for y in the first equation: $\displaystyle{2}{x}-{5}{\left({1}-{x}\right)}=-{26}\usepackage{cmbright}\Huge\$

Simplify this equation and solve for x. Then substitute the value of x that you get back into the first equation to find y.