b) 2x=2 / :2
x+y=2
x=1
1+y=2
y=1
c) x+1=3
y-x=-1
x=2
y-2=-1
d) x-2=-1
2x=y
2*1=y
y=2
e) x+2y=5 / *-3
3x-y=1
-3x-6y=-15
-5y=-14
y=2,8
x+2*2,8=5
x+5,6=5
x=-0,6
f) 2x+y=7 / *2
3x-2y=0
4x+2y=14
x=14
2*14+y=7
y=-21
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b) 2x=2 / :2
x+y=2
x=1
1+y=2
y=1
c) x+1=3
y-x=-1
x=2
y-2=-1
y=1
d) x-2=-1
2x=y
x=1
2*1=y
y=2
e) x+2y=5 / *-3
3x-y=1
-3x-6y=-15
3x-y=1
-5y=-14
y=2,8
x+2*2,8=5
x+5,6=5
x=-0,6
f) 2x+y=7 / *2
3x-2y=0
4x+2y=14
3x-2y=0
x=14
2*14+y=7
y=-21