Ответ:

Объяснение:

a) x=2-y

3*(2-y)-2y=11

6-3y-2y=11

6-5y=11

-5y=11-6

-5y=5

y=-5:5

y=-1

x=2-(-1)=2+1=3

b) y=11-2x

5x-(11-2x)=8

5x-11+2x=8

7x=8+11

7x=19

x=19/7=2 5/7

y=11-2* 19/7 = 11-38/7= 11-5 3/7= 10 7/7- 5 3/7 = 5 4/7

c) x=5+3y

2*(5+3y)+5y=-23

10+6y+5y=-23

11y=-23-10

11y=-33

y=-33:11

y=-3

x=5+3*(-3)=5-9=-4

d)3x=2y

x=2y/3

2*2y/3 - 3y=-5   *3

4y-9y=-15

-5y=-15

y=-15:(-5)

y=3

x=2*3/3=2