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y - druga liczba
y = 2x -9
x+y= 12
y= 2x- 9
x+ 2x -9=12
y= 2x-9
3x -9= 12 /+9
y= 2x-9
3x= 21 /:3
y= 2x -9
x= 7
y= 14-9
x= 7
y= 5
Spr.
7 + 5= 12
L=P
2* 7- 9 = 5
L=P
Szukane liczby to 5(y) i 7(x) .