Ответ:
\left \{ {{18x=180} \atop {y=30-7x}} \right.=>\left \{ {{x=10} \atop {y=-40}} \right." alt="\left \{ {{11x-y=150} \atop {7x+y=30}} \right. =>\left \{ {{18x=180} \atop {y=30-7x}} \right.=>\left \{ {{x=10} \atop {y=-40}} \right." align="absmiddle" class="latex-formula">
Ответ: (10;-40)
Объяснение: