Question

Нужно тщательно расписать второе и третье задание , очень нужна помощь

Answer 1

$2)\left \{ {{x+y=4} \atop {y+xy=6}} \right.\\\\\left \{ {{x=4-y} \atop {y+y(4-y)-6=0}} \right.\\\\\left \{ {{x=4-y} \atop {y+4y-y^{2}-6=0 }} \right.\\\\\left \{ {{x=4-y} \atop {y^{2}-5y+6=0 }} \right. \\\\\left \{ {{x=4-y} \atop {\left[\begin{array}{ccc}y_{1}=2 \\y_{2}=3 \end{array}\right}} \right. \\\\1)\left \{ {{y_{1}=2 } \atop {x_{1}=4-2=2 }} \right.\\\\2)\left \{ {{y_{2}=3 } \atop {x_{2}=4-3=1}} \right.\\\\Otvet:\boxed{(2;2),(1;3)}$

$\left \{ {{y=x^{2} } \atop {y=x+2}} \right.\\\\x^{2}=x+2\\\\x^{2}-x-2=0\\\\x_{1}=-1 ;x_{2}=2\\\\y_{1}=(-1)^{2}=1\\\\y_{2}=2^{2}=4\\\\Otvet:\boxed{(-1;1),(2;4)}$