Sagot :
Adım adım açıklama:
Ters orantı ise biri artar ise diğeri azaları yani:
(x-3).(y+1)=k "k" orantı sabiti.
x = 12 ve y = 15 iken:
9.16 = 144 yani k sabiti 144
y = 7 iken:
(x-3).8 = 144 olmalı
x-3 = 18 ise x=21 olur.
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