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Verified answer
1. a + b = 48a - b = 6
--------------- -
2b = 42
b=21
a+b = 48
a= 48 - b
a = 48-21
a=27
2. anggap a lebih besar dari b
maka
a-b = 7
a= 2b - 1
subsitusi ke persamaan 1
a-b=7
2b-1-b=7
b=8
a-b=7
a-8=7
a=15
3. Feri = 4 x Dian
Feri - Dian = 420.000
anggap Feri = a
Dian = b
a = 4b
a-b = 420.000
subsitusi
4b - b = 420.000
3b= 420.000
b = 140.000
a=4b
a = 4 x 140.000
=560.000
Jadi, uang Dian = 140.000
uang Feri = 560.000