Question

rozwiaz uklad rownan

2x-y=7

4(x+1)+2y=18

6x-2y=10

3x+4(1-y)=36

Answer 1

2x-y=7

4[x+1]+2y=18

 

y=2x-7

4x+4+2[2x-7]=18

 

y=2x-7

4x+4+4x-14=18

 

y=2x-7

8x=18+10

 

y=2x-7

x=28/8

 

x=3,5

y=2×3,5-7=0

 

x=3,5

y=0

spr. 2×3,5-0=7

4[3,5+1]+2×0=18

 

7-0=7

7=7

 

4×4,5+0=18

18=18

2]

6x-2y=10/:2

3x+4[1-y]=36

 

3x-y=5

3x+4-4y=36

 

y=3x-5

3x-4[3x-5]=36-4

 

y=3x-5

3x-12x+20=32

 

y=3x-5

-9x=32-20

 

y=3x-5

x=12:-9

 

x=-4/3

y=3×(-4/3)-5=-4-5=-9

 

x=-4/3

y=-9

spr.

6×-4/3-2×-9=10

-8+18=10

10=10

 

3×-4/3+4[1+9]=36

-4+40=36

36=36

Answer 2

1)

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