[tex] \left \{ {{3,5x+2y=24} \atop {7x+1,5y=35,5}} \right. \\ \left \{ {{[3,5x+2y=24]\cdot2} \atop {7x+1,5y=35,5}} \right. \\ \\ \left \{ {{7x+4y=48 \atop {7x+1,5y=35,5}} \right.[/tex]
se scad
[tex] \left \ {{7x-7x+4y-1,5y=48-35,5 \\ \\[/tex]
[tex]2,5y=12,5;\\ \\ y=12,5:2,5 \\ \\ y=5[/tex]
[tex]3,5x+2y=24 ; y=5 \\ \\ 3,5x+2\cdot5=24 \\ \\ 3,5x=14 \\ \\ x=4[/tex]
mere = 5 lei/kg iar rosii = 4/ lei kg
