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a+b=5
u4+u6=28
a+3b+a+5b=28
2a+8b=28 bagi 2
a+4b=14
a+b=5
a+4b=14
kurangkan
-3b=-9
b=3
a=5-3
a=2
U9= a+8b= 2+8(3)= 2+24=26
U2 = a + b = 5
U4 + U6 = (a + 3b)+(a + 5b) = 2a + 8b = 28
eleminasi
a + b = 5 --> ( kali 2 )
2a + 8b = 28
2a + 2b = 10
2a + 8b = 28
-6b = -18
b = 3
2a + 2b = 10
2a + 2(3) = 10
2a + 6 = 10
2a = 4
a = 2
U9 = a + 8b
= 2 + 8(3)
= 2 + 24
= 26
semoga bisa membantu, maaf kalau salah.
Thanks