Question

Система уравнений
помогите пожалуйста

Answer 1

$\displaystyle 1)\left \{ {{x-2y=6} \atop {2x+3y=1}} \right.\\\\ \left \{ {{x=6+2y} \atop {2x+3y=1}} \right.\\\\ 2(6+2y)+3y=1\\\\ y=-\frac{11}{7}\\\\ x=6+2*(-\frac{11}{7})\\\\ x=\frac{20}{7}\\\\ (x,y)=(\frac{20}{7},-\frac{11}{7})\\\\ 2)\left \{ {{x+y=3} \atop {x^2+y=5}} \right.\\\\ \left \{ {{y=3-x} \atop {x^2+y=5}} \right.\\\\ x^2+3-x=5\\x=-1,x=2\\y=3-(-1),y=3-2\\y=4,y=1\\(x_{1},y_{1})=(-1,4); (x_{2},y_{2})=(2,1)$