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2010-03-20T15:46:28+01:00
X/y=3
(x+y)-6=x-y

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

x=3y
4y-2y=6

x=3y
2y=6/:2

x=3y
y=3

x=3*3
y=3

x=9
y=3
2010-03-20T15:49:05+01:00
X/y=3
(x+y)-6=x-y

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

x=3y
2y=6

x=3y
y=3

x=9
y=3

2010-03-20T15:53:32+01:00
X/y=3
(x+y)-6=x-y

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

x-3y=0 ×2
x-x+2y=3 ×3
2x-6y=0
0+6y=18
2x=18
x=9

9+y-9+y=6
2y=6 ÷2
y=3