{y-x = -1, {5x+2y = -16. ​

{у-х=-1

{5х+2у=-16

{у=-1+х

{5х+2у=-16

5х+2(-1+х)=-16

х=-2

у=-1-2

у=-3

(х,у)=(-2-3)

3-3-(-2)=-1

5х(-2)+2х(-3)=-16

-1=-1

-16=-16

:(х,у)(-2-3)