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2010-03-23T16:11:49+01:00
2x+y=5
2(x-3)-6y=6
........
2x+y=5
2x-6-6y=6
.......
y=5-2x
2x-6(5-2x)=6+6
.......
y=5-2x
2x-30+12x=12
.........
y=5-2x
2x+12x=12+30
.......
y=5-2x
14x=42/:14
......
y=5-2x
x=3
.....
y=5-2*3
x=3
.........
y=5-6
x=3
........
x=3
y=-1
1 5 1
2010-03-23T16:14:08+01:00
2x+y=5
2(x-3)-6y=6

y=5-2x
2(x-3)-6(5-2x)=6

y=5-2x
2x-6-30+12x=6

y=5-2x
2x+12x=6+6+30

y=5-2x
14x=42|:14

y=5-2x
x=3

x=3
y=5-2*3

x=3
y=-1