Odpowiedzi

2012-08-04T19:01:24+02:00

1/2(x-1)+y=-5/2 /*2

x-7=1-y

 

x-1+2y=-5

x+y=1+7/*(-1)

 

x+2y=-4

-x-y=-8

_______+

y=-12

x-12=8

x=8+12=20

 

x=20

y=-12