Question

Un laptop si o tableta costa 1700 lei , iar 3 leptopuri si 4 tablete costa 5300 lei.Ce pret are fiecare obiect?

Answer 1

x-laptop

y-tableta

x+y=1700<=> x=1700-y

3x+4y=5300<=> 3(1700-y)+4y=5300<=> 5100-3y+4y=5300<=> y=200

                                x=1700-200<=> x=1500

Answer 2

1.Aflati cat costa 2 leptopuri si 3 tablete.
5300-1700=3600
2.Afla cat costa 2 leptopuri si 2 tablete.
1700+1700=3400
3.Afla cat costa 4 tablete si 4 leptopuri.
3400+3400=6800
4.Afa cat costa 1 leptop.
6800-5300=1500
5.Afla cat costa1 tableta.
1700-1500=200