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x-y=1
x=6-y
x-y=1
x=6-y
6-y-y=1
x=6-y
-2y=-5 |:(-2)
x=6-y
y=2,5
x=6-2,5
y=2,5
x=3,5
y=2,5
x+y=7
x-y=1
x=7-y
x-y=1
x=7-y
7-y-y=1
x=7-y
-2y=-6 |:(-2)
x=7-y
y=3
x=7-3
y=3
x=4
y=3
Myślę, że pomogłam i liczę na naj :)