Question

Зделайте 1,4,7 3.2
Даю 30 балов ​

Answer 1

Ответ:

1) x=6+y

6+y+(6+y)*y=-4

y^2+7y+10=0

(y+5)(y+2)=0

y1=-5

y2= -2

x1=6-5=1

x2=6-2=4

4) y=14-x^2

x-(14-x^2)=-8

x^2+x-6=0

(x+3)(x-2)=0

x1=-3

x2=2

y1=14-(-3)^2=5

y2=14-2^2=10

7) x=y-8

(y-8)y=-7

y^2-8y+7=0

(y-1)(y-7)=0

y1=1

y2=7

x1=1-8=-7

x2=7-8=-1