Ответ:

Х=2-y

5(2-y)+2y=3

10-5y+2y=3

-3y=-7

y=7/3=2,(3)

X=2-7/3=0,(3)

x + y = 2

5x + 2y = 3

х=2-у

5(2-у)+2у=0

х=2-у

10-5у+2у=0

х=2-у

-3у=-10

х=2-10/3

у=10/3

х=-4/3

у=10/3

(-4/3 ; 10/3)