Schema:
1 laptop + 1 tableta = 1700lei
3 laptopuri + 4 tablete = 5300lei
Rezolvare:
Notam laptop cu x si tableta cu y
1)Cat costa o tableta?
x+y=1700lei
3x+4y=5300lei
x=1700-y
Substituim in loc de x........1700-y
3(1700-y)+4y=5300lei
y=200lei
2)Cat costa un laptop?
1700-200=1500lei