Помогите решить
{x-5y=9
{x^2+3xy-y^2=3

x=9+5y(9+5y)²+3y(9+5y)-y²-3=081+90y+25y²+27y+15y²-y²-3=039y²+117y+78=0y²+3y+2=0y1+y2=-3 U y1*y2=2y1=-2⇒x1=9-10=-1y2=-1⇒x2=9-5=4(-1;-2) U (4;-1)