x-2y=-7 4x+7y=17 срочно

{x-y=2

{2x-3y=-1

x=2+y

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

4+2y-3y=-1

-y=-1-4

-y=-5|:(-1)

y=5

x-5=2

x=2+5

x=7

{-x+y=4

{4x+y=-1

y=4+x

4x+4+x=-1

5x=-1-4

5x=-5|:5

x=-1

-(-1)+y=4

y=4-1

y=3

{3x+y=4

{5x+y=10

y=4-3x

5x+4-3x=10

2x=10-4

2x=6|:2

x=3

3*3+y=4

y=4-9

y=-5

{8x-3y=7

{3x+y=9

y=9-3x

8x-3(9-3x)=7

8x+27+9x=7

17x=7-27

17x=-20|:17

x=-20/17

-20/17*3+y=9

y=9+60/17

y=12 9/17

{x+2y=-2

{0,5x-y=6

x=-2-2y

(-2-2y)0,5-y=6

-1-1-y=6

-y=6+2

-y=8|:(-1)

y=-8

x-8*2=2

x=2+16

x=18

{12x-y=18

{x+0,5y=5

x=5-0,5y

(5-0,5y)12-y=18

60-6y-y=18

-7y=18-60

-7y=-42|:(-7)

y=6

x+0,5*6=5

x=5-3

x=

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