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y - Balladyna
{x+y=12,5 /×(-1,2)
{1,2x+0,8y=13
{-1,2x-1,2y=-15
{1,2x+0,8y=13
-0,4y=-2 /:(-0,4)
y=5 → Balladyna
1,2x+0,8y=13
1,2x=13-0,8y
1,2x=13-0,8×5
1,2x=13-4
1,2x=9 /:1.2
x=7,5 → Alina
Odp: Wiecęj malin zebrała Alina - 7,5kg.