Question

boua masinute si o minge costa 120 de lei o masinuta si 2 mingi costa 105 de lei c
cat coata omasinuta si cat costa o minge

Answer 1

x=masinute
y =minge
2x+ y =120   I *2
1x +2y =105

4x+2y =240  I -
1x+2y =105
------------------------
3x   /  =135
x =135:3 =45  lei
2*45 +y =120
90+y =120
y =120-90
y =30 lei
verif  ;   45+2*30 =45+60 =105 lei