Sagot :
Cevap:
C) 20
Adım adım açıklama:
x/y = 2/3
(x-10)/(y-10) = -1
Birinci denklem
3x = 2y
x = 2y/3
İkinci denklem
x - 10 = -y + 10
x + y = 20 zaten bize x + y'yi soruyor cevap 20 ama ispatlayalım.
x + y = 20
2y/3 + y = 20
5y/3 = 20
5y = 60
y = 12
x = 8
kesrimiz 8/12
8 - 10 = -2
12 - 10 = 2
-2/2 = -1
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