Question

даю 60 баллов помогите пожалуйста

Answer 1

Решение на фото.

х² + у²=(-1)² + 7²=1 + 49=50.

Answer 2

$\left \{ {{\dfrac{x-5}{6}+\dfrac{y+3}{5}=1} \atop {y+2x=5}} \right. \\\\\left \{ {{\dfrac{x-5}{6}\cdot 30+\dfrac{y+3}{5}\cdot 30=1\cdot 30} \atop {y+2x=5}} \right.\\\\\left \{ {{5\cdot (x-5)+6\cdot (y+3)=30} \atop {y+2x=5}} \right.\\\\\left \{ {{5x-25+6y+18=30} \atop {y+2x=5}} \right. \\\\\left \{ {{5x+6y=37} \atop {y=5-2x}} \right.\\\\\left \{ {{5x+6\cdot (5-2x)=37} \atop {y=5-2x}} \right.\\\\\left \{ {{5x+30-12x=37} \atop {y=5-2x}} \right.$

$\left \{ {{-7x=7} \atop {y=5-2x}} \right.\\\\\left \{ {{x=-1} \atop {y=5-2\cdot (-1)}} \right. \\\\\left \{ {{x=-1} \atop {y=7}} \right. \\\\Otvet:\boxed{(-1 \ ; \ 7)}$

(-1)² + 7² = 1 + 49 = 50