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Verified answer
A + b = 6b = 6 - a ......(1)
b+c = 12 .......(2)
a+c = 12 .......(3)
Masukkan persamaan (1) ke persamaan (2)
b + c = 12
6 - a + c = 12
-a + c = 6 ......(4)
Eliminasi persamaan (4) dan (3)
-a + c = 6
a + c = 12
--------------- -
-2a = -6
a = 3
Masukkan nilai a ke persamaan (3) dan (1)
a + c = 12
c = 12 - a = 12 - 3 = 9
a + b = 6
b = 6 - a = 6 - 3 = 3
Diperoleh nilai a = 3, b = 3 dan c = 9
a + b + c = 3 + 3 + 9 = 15
Nilai a + b + c adalah 15