Question

Решите систему уравнений:

Answer 1

$left { {{x+y=9} atop {y^{2}+x=29}} right.$
$left { {{x=9-y} atop {y^{2}+x-29=0}} right.$
$left { {{x=9-y} atop {y^{2} + 9 - y -29=0}} right.$
$left { {{x=9-y} atop {y^{2} - y - 20 =0}} right.$
$y^{2} - y - 20 = 0$
D=1+80=81
y=$frac{1+-9}{2}$
y=5; -4
x=9-y
x=4; 13
Ответ: (4; 5), (13; -4)