Question

Решите систему верхняя строка x-y=1.нижняя x*y=6

Answer 1

$\left \{ {{x-y=1} \atop {x*y=26} \right. \left \{ {{x=1+y} \atop {(1+y)*y=6}} \right. \left \{ {{{x=1+y} \atop {y^{2}+y-6=0 \right.$

1)$y^{2}+y-6=0$

D = 1 + 4*6 = 25

y1 = $\frac{-1+5}{2}$=2

y2 = $\frac{-1-5}{2}$= -3

2) 1.х = 1+2=3

2.х=1-3= -2