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Un laptop si o tableta costa 1700 lei , iar 3 laptopuri si 4 tablete costa 5300 lei.

ce pret are fiecare obiect ?


Răspuns :

L+T=1700=>L=1700-T 3L+4T=5300 3 (1700-T)+4T=5300 5100-3T+4T=5300 T=200lei L=1700-200=1500lei
l+t=1700|x3
3l+4t=5300

3l+3t=5100
3l+4t=5300
--------------------
/----t=200
l+200=1700
l=1700-200
l=1500