Question

Решите систему уравнений:

х^2+у^2=17

х-у=-5

Answer 1

x=-5+y

(-5+y)^2+y^2=17

 

25-10y+y^2+y^2-17=0

2y^2-10y+8=0

D=100-64=36

x1/2=10+-6/4

x1=4. x2=-1

 

 

x1=4

y1=9

 

x2=-1

y2=-4