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10-2=8
y=druga liczba
x+y=12
x-y=8
x=12-y
12-y-y=8
-2y=8-12
-2y=-4
y=4:2
y=2
x=12-2=10
odfp. szukane liczby to 10 i 2
10 - 2 = 8
_____________________________________________
/12 = x + y
\8 = x - y
/x = 12 - y
\x - y = 8
12 - y - y = 8
4 = 2y
y = 2
x - 2 = 8
x = 10
/x = 10
\y = 2