1) х-у=8

-у=8-х |: -

у=х-8

2) х^2+2(х-8)=33

х^2+2х-16=33

х^2+2х=33+16

х^2+2х-49=0

Д= 4+(49×4)=196

х1= (-2+14)/2 = 6

х2= (-2-14)/2 = -8

3) у1=6-8

у1= -2

у2= -8-8

у2= -16