Answer:
Step-by-step explanation:
[tex]\left\{\begin{array}{ccc}x-4y=-8\\-3x+12y=24&\text{divide both sides by 3}\end{array}\right\\\underline{+\left\{\begin{array}{ccc}x-4y=-8\\-x+4y=8\end{array}\right}\qquad\text{add both sides of the equations}\\.\qquad\qquad0=0\qquad\bold{TRUE}[/tex]