👤

2a+b=79
2c+3b=99
Afla: 4a+5b+2c


Răspuns :

Răspuns:

2a+b=79 |•2

2c+3b=99

4a+2b=158

2c+3b=99

Le adunăm

4a+5b+2c=257

Răspuns:

2a+b=79 I·2 =>4a+2b=158

2c+3b=99

4a+2b+2c+3b=158+99

4a+5b+2c=257