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y cena stolika
x+y=4050
1.25x+1.4y=5310
y=4050-x
1.25x+1.4(4050-x)=5310
y=4050-x
1.25x-1.4x=5310-5670
y=4050-x
-0.15x=-360 /:-0.15
y=4050-x
x=2400
y=4050-2400=1650
Odp. Antykwariusz zapłacił za lustro 2400 zł a za stolik 1650 zł.