Odpowiedzi

2010-03-03T14:48:45+01:00
X+3y=3
x-y=5/+y

x+3y=3
x=5-y

5-y+3y=3
x=5-y

5+2y=3/-5
x=5-y

2y=-2/:2
x=5-y

y=-1
x=6








2010-03-03T14:52:37+01:00
X+3y=3
x-y=5

2y=-2/2
y=-1

x-(-1)=5
x=5+1
x=6