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U4+U6 = 28 shg U5 = 28/2 =14
b = (14-5)/(5-2) = 9/3 = 3
U9 = U5+4b = 14 + 4(3) = 14 + 12 = 26
(a + 3b) + (a + 5b) = 28
2a + 8b = 28
a + 4b = 14
eliminasi:
a + 4b = 14
a + b = 5
_________ -
3b = 9
b = 3
a = 2
U9 = a + 8b
= 2 + 24
= 26