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2009-09-04T17:17:35+02:00
2x+y=0
x+2y=6

2x=-y
x+2y=6

x=-y/2
x+2y=6

-y/2+2y=6
3/2*y=6 /*2
3y=12 /:3
y=4

2x=-y
2x=-4 /:2
x=-2

x=-2
y=4
2009-09-04T17:20:37+02:00
2x+y=0
x+2y=6

y=-2x
x+2*(-2x)=6

5x=6
x=5/6

2*5/6+y=0
y=-5/3

x=5/6
y=-5/3
2009-09-04T17:21:16+02:00
2x+y=0
x+2y=6 /*(-2)

2x+y=0
-2x-4y=-12

3y=12/3
y=4
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2x+y=0/*(-2)
x+2y=6

-4x-2y=0
x+2y=6

3x=6 /3
x=2