{x2+y2=17 {xy=4 pojalusta bisto pomogite

{x²+y²=17{xy=4{(x+y)²-2xy=17{xy=4(x+y)²-8=17(x+y)²=25(x+y)=±51){x+y=5;x=5-y {xy=4(5-y)y=45y-y²=4y²-5y+4=0D=25-16=9=3²y=(5±3)/2y1=4;y2=1x1=1;x2=42){x+y=-5;x=-5-y {xy=4(-5-y)y=4y²+5y+4=0y=(-5±3)/2y1=-4;y2=-1x1=-1;x2==-4otvet (1;4);(4;1);(-1;-4);((-4;-1)