[tex]\begin{gathered} 14x+3y=11 \\ -14x-2y=9 \end{gathered}[/tex]
add the equations together
since y=20, replace in one of the equations to solve for x
[tex]\begin{gathered} 14x+3(20)=11 \\ 14x+60=11 \\ 14x=-49 \\ x=-\frac{49}{14} \\ x=-\frac{7}{2} \end{gathered}[/tex]
the solution of the system of equations is (-7/2,20)
