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Ответ:

1

2x-4y=0

5x+y=15

2x-4y=0

y=15-5x

2x-4*(15-5x)=0

x=30

11

y=15-5*30

11

y=15

11

(x,y) (30 15)

( 11 11)

2*(30) - 4* 15

(11). (11)

0=0

15=15

2

x=2y+5

3x+2y=7

3(2y+5)+2y=7

y=-1

x=2*(-1) +5

x=3

(x,y) (3,-1)

x=2*(-1) +5

3*3+2*(-1)=7

(x,y) (3,-1)

3

x-2y=5

2x+y=-5

x=5+2y

2x+y=-5

2(2y+5)+y=-5

y=-3

x=5+2*(-3)

x=-1

(x,y) (-1,-3)

-1-2*(-3)=5

2*(-1) + (-3) =-5

5=5

-5=-5

(x,y) (-1,-3)

4

4y-2x=11

6y-x=13

4y-2x=11

x=-13+6y

4y-2(-13+6y)=11

y=15

8

x=-13+6*15

8

x= -7

-4

(x,y) (-7). 15

(-4). 8

4*(-7) - 2* (15)

(-4). (8)

6*(15) - (-7) =13

(8). (-4)

11=11

13=13

(x,y) (-7). ( 15)

(-4). (8)