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y - druga liczba
x + y = 12,4
x - y = 5,6
dodajemy stronami
x + x + y - y = 12,4 + 5,6
2x = 18
x = 18/9 = 2
2 + y = 12,4
y = 12,4 - 2 = 10,4
odp
x = 2
y = 10,4
y-druga liczba
x+y=12,4
x-y=5,6
__________
+
2x=18 |:2
x=9
y=12,4-9
y=3,4
Odp.; Te liczby to 9 i 3,4.