Răspuns :
Fie c pretul unui creion si p pretul unui pix.
5c+6p=28
3c+6p=24
(5c+6p)-(3c+6p)=4
2c=4
c=2
[tex] \left\{ {{5c + 6p=28} \atop {c=2}} \right. => 6p=28-10=18[/tex]
=> p=18:6 = 3
23c = 23*2 = 46 lei
11p = 11*3 = 33 lei
5c+6p=28
3c+6p=24
(5c+6p)-(3c+6p)=4
2c=4
c=2
[tex] \left\{ {{5c + 6p=28} \atop {c=2}} \right. => 6p=28-10=18[/tex]
=> p=18:6 = 3
23c = 23*2 = 46 lei
11p = 11*3 = 33 lei
5c ........6p.......28lei
3c.........6p........24lei
Atunci:
2c........0p........4lei
1c....................2 lei
s.a.m.d.
3c.........6p........24lei
Atunci:
2c........0p........4lei
1c....................2 lei
s.a.m.d.