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un laptop si o tableta costa 1700 lei iar 3 laptopuri si 4 tablete costa5300 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=200
L=1700-200⇒L=1500

a - laptop
b - tableta
a+b= 1700
a=1700-b
3a+4b= 53000=> 3 (1700-b)
= 5100-3b+4a= 5300
b=200 iar a = 1700-200=> a= 1500