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4a +2(f-1,50)=12
11a+5f=40
4a+2f-3=12
11a+5f=40/*2
4a+2f=15/*-5
22a+10f=80
-20a-10f=-75
2a=5
a=2,50
a- cena albumu
f- cena figurki
Album kosztował 2,50 zł
y - figurki
11x + 5y = 40
4x + 2(y-1,5) = 12
11x + 5y = 40
4x + 2y - 3 = 12
11x + 5y = 40
4x + 2y = 12 + 3
11x + 5y = 40 /*2
4x + 2y = 15 /*(-5)
22x + 10y = 80
-20x - 10y = -75
--------------------
22x - 20x + 10y - 10y = 80 - 75
2x = 5/2
x = 2,5
11x + 5y = 40
x = 2,5
11 * 2,5 + 5y = 40
x = 2,5
27,5 +5y = 40
x = 2,5
5y = 40 - 27,5
x = 2,5
5y = 12,5/:5
x = 2,5
y = 2,5
x = 2,5
Odp. Album kosztował 2,5zł.