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y-spinki
4x+6y=4,80
g+10y=4,60 /(-4)
4x+6y=4,80
-4g-40y=-18,4
________________________+
-34y=-13,6/-13,6
y=2,5
4x+6*2,5=4,80
4x+15=4,80
4x=15-4,80
4x=10,2/4
x=2,55
y=2,5
Odp: Cena jednej gumki wynosiła 2,55 zł, a spinki 2,50 zł.