Respuesta :

We have the folllowing:

[tex]\begin{gathered} m1=2x+40 \\ m2=2y+40 \\ m3=x+2y \\ m1=m3 \end{gathered}[/tex]

solving, m1 = m3

[tex]\begin{gathered} 2x+40=x+2y \\ 2x-x+40-2y=0 \\ x-2y+40=0 \end{gathered}[/tex]