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Daca 2a+3b=31 si 2b+5c=69, sa se afle 2a+9b+15c.

Răspuns :

2a+3b=31
2b+5c=69 I x3
2a+3b+6b+15c=31+207
2a+9b+15c=238
2a+3b=31
2b+5c=69*3
2a+3b+6b+15c=31+207
2a+9b+15c=238
Sper ca team ajutat!!!