Question

Решите систему пжлст 9 класс)

Answer 1

{x-2y²=2
{3x+y=7⇒y=7-3x
x-2(7-3x)²=2
x-98+84x-18x²-2=0
18x²-85x+100=0
D=7225-7200=25
x1=(85-5)/36=20/9⇒y1=7-60/9=1/3
x2=(85+5)/36=5/2⇒y2=7-15/2=-1/2
(20/9;1/3);(5/2;-1/2)