Respuesta :

Answer:

[tex]x = -8\\ y = -36[/tex]

Step-by-step explanation:

[tex]-7x+y=-20\\ 9x-3y=36\\ \textbf{Multiply 3 to the first equation}\\-21x + 3 y = -60\\\textbf{Use the elemination method}\\ -12x = 96\\ x = -8\\ y = -36[/tex]