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U4 = a + 3b = 11
5b = 15
b = 3
a + 9 = 11
a = 2
U11 = 2 + 10.3 = 32
U9= a+8b=26
1 . U4 dan U9 dieliminasi sehingga menghasilkan b=3
2 . b=3 disubstitusikan ke persamaan boleh U4 dan U9 sehingga menghasilkan a=2
3.U11 = a+ 10b = (2) + 10(3) = 2 + 30 = 32
jadi , U11 adalah 32