2x+5xy=14 { y-5xy=-9

}2x+5xy=14}y-5xy=-92x+y=5 => y=5-2x2x+5x(5-2x)=142x+25x-10x²-14=010x²-27x+14=0D=27²-4*10*14=729-560=169=13²x1=27+13/20=40/20=2 <=> y15-4=1x2=27-13/20=14/20=7/10 <=> y2=5-14/10=3,6ответ: (2; 1) (0,7; 3,6)