Question

Помогите решить системи!!!
Даю 50 баллов ​

Answer 1

Ответ:

1) x=-8; y=12

2) x=3; y=-1/3

x=7; y=1

Объяснение:

1) $\left \{ {{x+y=4} \atop {5xy-x=-64}} \right. \\\left \{ {{x=4-y} \atop {5(4-y)-(4-y)=-64}} \right.\\\left \{ {{x=4-y} \atop {20-5y-4+y=-64}} \right. \\\left \{ {{{x=4-y} \atop {-4y-16=-64}} \right.\\\left \{ {{x=4-y} \atop {y=12}} \right.  \left \{ {{y=12} \atop {x=-8}} \right.$

2)

$\left \{ {{x=4+3y} \atop {xy-6y=1}} \right.\\ (4+3y)y-6y=1\\3y^{2} -2y-1=0\\y=1  \\or\\y=-1/3\\\\x=4+3*(-1/3);y=-1/3\\or\\x=4+3*1;y=1\\x=3/x=7\\\left \{ {{x=3} \atop {y=-1/3}} \right.\\\left \{ {{x=7} \atop {y=}1} \right.$