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2010-01-11T20:13:05+01:00
X+y=3
x-2y=6

x=3-y
3-y-2y=6

x=3-y
-3y=6-3

x=3-y
-3y=3/:(-3)

x=3-y
y=-1

x=3+1
y=-1

x=4
y=-1
2010-01-11T20:13:55+01:00
(x+y=3
(x-2y=6

(x=3-y
(3-y-2y=6

(x=3-y
(3-3y=6/(-3)

(x=3-y
(y=2

(x=3-2
(y=2

(x=1
(y=2



2010-01-11T20:14:26+01:00
X+y=3
x-2y=6

x=3-y
3-y-2y=6-y

x=3-y
-3y+y=6-3

x=3-y
-2y=3

x=3+1,5
y=-1,5

x=4,5
y=-1,5