Ответ:

На фото ...............

[tex]\displaystyle\bf\\\left \{ {{ - 2x + y = 4} \atop {x + 3y = 5 \: \: | \times 2 }} \right. \\ \displaystyle\bf\\ + \left \{ {{ - 2x + y = 4} \atop {2x + 6y = 10 }} \right. \\ \\ y + 6y = 4 + 10 \\ 7y = 14 \\ y = 14 \div 7 \\ y = 2 \\ \\ x + 3 \times 2 = 5 \\ x + 6 = 5 \\ x = 5 - 6 \\ x = - 1[/tex]

Ответ: ( - 1 ; 2 )