Question

Proszęę szyybkooo ! :D

Answer 1

y+6-2x=0

x-2=10-5y

y-2x=-6

5y+x=10/*2

y-2x=-6

10y+2x=20

-------------

11y=14//11

y=14/11

14/11-2x=-6

-2x=14/11-6

dalej już dasz rade wystarczy odjąć (jak coś pisz ;))

 

 

3x-3y+4x=8

3x-15y=5-9y

7x-3y=8/*2

3x-6y=5

14x-6y=16

3x-6y=5

----------

17x=21//17

x=21/17

3*21/17-6y=5

dalej ciągniesz sam. jak coś to pisz. pozdrawiam ;)

Answer 2

y + 2(3 - x) = 0

x - 2 = 5(2 - y)

 

y + 6 - 2x = 0

x - 2 = 10 - 5y

 

y - 2x = -6

x + 5y = 12 / *2

 

y - 2x = -6

2x + 10y = 24

________________

y + 10y - 2x + 2x = -6 + 24

11y = 18

y = 18/11

 

18/11 + 6 - 2x = 0

84/11 - 2x = 0

-2x = -84/11 / *-1/2

x = 42/11

 

 

 

3(x - y) + 4x = 8

3(x - 5y) = 5 - 9y

 

3x - 3y + 4x = 8

3x - 15y = 5 - 9y

 

7x - 3y = 8 /*(-2)

3x - 6y = 5

 

-14x + 6y = -16

3x - 6y = 5

________________

3x - 14x + 6y - 6y = 5 - 16

-11x = -11 /:(-11)

x = 1

 

3 * 1 - 15y = 5 - 9y

-15y + 9y = 5 - 3

-6y = 2 /:(-6)

y = -2/6

y = -1/3