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=-5-2×0=-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=16-4×3×1=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)