Substitute $\displaystyle{x}={2}\usepackage{cmbright}\Huge\$ into Equation B: $\displaystyle{4}{\left({2}\right)}+{3}{y}={26}\usepackage{cmbright}\Huge\$

Simplify: $\displaystyle{8}+{3}{y}={26}\usepackage{cmbright}\Huge\$

Solve the equation for y: $\displaystyle{3}{y}={18}\usepackage{cmbright}\Huge\$ , so $\displaystyle{y}={6}\usepackage{cmbright}\Huge\$