Question

Пожалуйста, решите систему уравнения. Срочно!

Answer 1

$\left\{ {{7x-4y=43} \atop {7x-3y=83}} \right. \\\\\left\{ {{7x=43+4y} \atop {43+4y-3y=83}} \right. \\\\\left\{ {{7x=43+4y} \atop {y=40} \right. \\\\\left\{ {{7x=43+4*40} \atop {y=40} \right. \\\left\{ {{7x=203} \atop {y=40} \right. \\\left\{ {{x=203/7 \atop {y=40} \right. \\\\\left\{ {x=29} \atop {y=40} \right.$