Question

un telefon si o tableta 1700 de lei iar 3 telefoane si 2 tablete costa 4600de lei
cat costa o tableta

Answer 1

1telefon........................1Tableta...................1700
3telefoane....................2 Tabelete................4600

3telefoane.....................2 Tablete................4600    -
2telefoane.....................2Tablete.................3400
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1telefon=1200
1Tableta= 1700-1200=500

Answer 2

tel = a
tab = b

a + b = 1300 => a = 1300 - b
3a + 4b = 4600
3 x ( 1300 - b ) + 4b = 4600
3900 - 3b + 4b = 4600
b = 4600 - 3900
b = 500 ( lei costa o tableta )
a = 1200 ( lei costa un telefon )