Помогите дам 50 баллов

1)
у=-5-2х
х^2+(-5-2х)^2=25
х^2+25+20х+4х^2=25
5х^2+20х=25-25
5х^2+20х=0
5х(х+4)=0
5х=0
х1=0
х+4=0
х2=-4
у1=-5-20=-5
у2=-5-2(-4)=3
(0;-5)(-4;3)

2)
у=4+2х
х^2+6х+7=4+2х
х^2+6х+7-4-2х=0
х^2+4х+3=0
д=16-431=4
х1=(-4-2)/2=-3
х2=(-4+2)/2=-1
у1=4+2(-3)=-2
у2=4+2(-1)=2
(-3;-2)(-1;2)

 y+2x=-5
 x^2+y^2=25
y= -5-2x

x^2+ 25+4x^2=25
5x^2=25-25
5x^2=0
x=0
y= -5

y=x^2+6x+7
y-2x=4

x^2+6x+7-2x=4
x^2+4x+3=0
x1*x2=3
x1+x2= -4
x1= -1
x2= -3
y=4+2x
y1=4-2=2
y2=4-6= -2