Odpowiedzi

2009-12-07T15:06:42+01:00
{6x-3y=9
{x+5y=-9,5

6x-3y=9
x=9,5-5y

6(9,5-5y)-3y=9
x=9,5-5y

57-30y-3y=9
x=9,5-5y

-33y=-66
x=9,5-5y

y=2
x=9,5-5*2

y=2
x=-0,5
2009-12-07T15:12:54+01:00
6x-3y=9 /:-6
x+5y=-9,5

-x+½y=-3/2
x+5y=-9,5

5,5y=-9,5-3/2
11y/2 =-11 /×2/11
y=-2

6x+6=9
6x=3
x=1/2

/-kreska ulamkowa