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2010-01-06T16:45:40+01:00
Y+2-3+x=0
x-2=5-2+y

y+x=1
x=5+y

y+5+y=1
x=5+y

2y=-4/:2
x=5+y

y=-2
x=5-2

x=3
y=-2
2010-01-06T22:18:48+01:00
A)
y + 2 - (3 - x) = 0
x - 2 = 5 - (2 - y)

y+2-3+x=0
x-2=5-2+y

y+x=-2+3
x-y=3+2

y+x=1
x-y=5

x=1-y
1-y-y=5

x=1-y
1-2y=5

x=1-y
-2y=5-1

x=1-y
-2y=4 /:(-2)

x=1-y
y=-2

x=1+2
y=-2

x=3
y=-2