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un telefon si o tableta costa 1300lei,iar 3telefoane si 4tablete costa 4400lei.ce pret are o tableta.a.1000lei ,b.700lei, c.350lei ,d.500lei.


Răspuns :

a-telefon ,b- tableta
a+b=1300
3a+4b=4400
a=1300-b
3(1300-b)+4b=4400
3900-3b+4b=4400
b=500lei tableta
a=1300-500=800 lei telefon