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x-y=6
x+y=8
-------------------
2x=14 |:2
x=7
7-y=6
-y=-1
y=1
b)
-x+3y=7
x+2y=3
--------------------
5y=10 |:5
y=2
-x+3·2=7
-x=7-6
x=-1
c)
3x-5y=1
2x+5y=9
---------------------
5x=10 |:5
x=2
3·2-5y=1
-5y=1-6
-5y=-5
y=1