x-1kg cukru, y-1kg-mąki
200x+150y=900/*5
250x+180y=1110/*(-4)
1000x+750y=4500
-1000x-720y=-4440/oba równania dodajemy stronami
30y=60
y=60/30
y=2
200x+150y=900/podstawiamy za y 2 do pierwszego rownania i obliczamy x
200x+150*2=900
200x+300=900
200x=600
x=600/200
x=3-cena 1kgcukru
y=2-cena 1kg maki
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x-1kg cukru, y-1kg-mąki
200x+150y=900/*5
250x+180y=1110/*(-4)
1000x+750y=4500
-1000x-720y=-4440/oba równania dodajemy stronami
30y=60
y=60/30
y=2
200x+150y=900/podstawiamy za y 2 do pierwszego rownania i obliczamy x
y=2
200x+150*2=900
y=2
200x+300=900
y=2
200x=600
y=2
x=600/200
y=2
x=3-cena 1kgcukru
y=2-cena 1kg maki