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DANE:
x- cena gumki
y- cena spinki
4x+6y=4,80
x+10y=4,60
4x+6y=4,80
x=4,60-10y
4(4,60-10y)+6y=4,80
x=4,60-10y
18,40-40y+6y=4,8
x=4,60-10y
18,40-4,80=40y-6y
x=4,60-10y
13,60=34y /:34
x=4,60-10y
y=0,40
x=4,60-10*0,40
y=0,40
x=4,60-4,00
y=0,40
x=0,60
Odp.Jedna gumka kosztowała 0,60zł, a jedna spinka 0,40zł.
y - cena jednej gumki
układ równań:
4y+6x = 4.80
y+10x = 4.60 /razy -4
4y+6x = 4.80
-4y-40x = -18.40
-34x = -13,60
x=0,40
x=0,40
y = 4,60 - 4 = 0.60
Odp: jedna spinka kosztuje 40 gr a jedna gumka 60 gr