Odpowiedzi

2009-12-03T14:21:07+01:00
7a+2b=54-12
6a+9b=126

7a+2b=42 /*(-9)
6a+9b=126 /*2

-63a-18b=-405
12a+18b=252

-51a=-153
a=3

7a+2b=42
7*3+2b=42
21+2b=42
2b=42-21
b=21
a=3
2009-12-03T14:23:54+01:00
6a+9+b+3+a+b=54
9b+6a=126

7a+2b=54-12
6a+9b=126 /:3

7a+2b=42 /*3
2a+3b=42 /*(-2)

14a+4b=84
-14a-21b=-294
--------------------
-17b=-210 /:(-17)
b= 210/17

7a+2b=42
7a+2*210/17=42
7a=42- 420/17
7a=(714-420)/17
7a=294/17 /:7
a=294/(17*7)
a=294/119
a=42/17