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y-cena spinki
4x+6y=4,80
x+10y=4,60 /*-4
4x+6y=4,80
-4x-40y=18,40
-34y=13,60 /:-34
y=0,40
4x+2,40=4,80
4x=2,40
y=0,60
odp:gumka kosztowala 0,40 ggr a spinka 0,60 gr
y- cena jednej spinki
4x+6y=4,8
x+10y=4,6/*(-4)
4x+6y=4,8
-4x-40y= -18,4
-34y=-13,6
y=0,4
4x+6*0,4=4,8
4x=4,8-2,4
4x=2,4
x=0,6
odp; Jedna gumka kosztuje 0,60zł , jedna spinka 0,40zł.