Odpowiedź:
[tex]\left \{ {{2*(y+7) + y = -1} \atop{x=y+7}} \right.[/tex]
[tex]\left \{ {{3y = -15} \atop {x=y+7}} \right.[/tex]
[tex]\left \{ {{y=-5} \atop {x=2}} \right.[/tex]
