Ответы и объяснения

2012-12-28T13:35:55+04:00

x-3y+3=0

x-y=1

 

x-3y=-3|*(-1)

x-y=1|*(1)

 

-x+3y=3

x-y=1

 

2y=4

x-y=1

 

y=2

x-2=1

 

x=3

y=2

 

2012-12-28T16:13:07+04:00

x-3y+3 = 0

x-y = 1

__________

x-3y+3 = 0

x=1+y

____________

 

1+y-3y+3=0

x=1+y

____________

-2y=-4

y=2

x=1+2=3