Odpowiedzi

2009-12-15T16:15:59+01:00
{ 5b+3 = 5a+3b
[ 5a+7 = 4b-2

[3=5a-2b
[9=4b-5a

*[5a-2b=3
[4b-5a=9

{5a-2b=3
{-5a+4b=9
----------------- +
2b =12 ||:2
b = 6

* 5a - 12 = 3 |+12
5a = 15 ||:5
a = 3

{a=3
{b=5.