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x + (x+200)=1600
1600-200=1400
2x=1400/2
x=700
700+200=900 - cena pralki
700+700+900=2300
y - cena lodówki
x+y=1600
y=x-200
x+x-200=1600
2x=1800
x=900
y=900-200
y=700
2*700 =1400 + 900 = 2300
odp: Za dwie lodówki i pralkę zapłacono 2300 zł