Respuesta :

Given:

[tex]\begin{gathered} 5x-3y=42 \\ 2x-y=10 \end{gathered}[/tex]

Abigail made a mistake at step 3. This should be:

[tex]5x-6x+30=42[/tex][tex]-x=42-30[/tex][tex]-x=12[/tex][tex]x=-12[/tex]