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U2 = 15
S10 = 255
persamaan 1 :
U2 = a + b
15 = a + b.............a= 15 - b
persamaan 2:
S10 = 10/2 (a + U10)
255 = 5 (a + a + 9b)
51 =2a + 9b
subtitusi persamaan 2 ke persamaan 1 :
51 = 2(15 - b) + 9b
51 = 30 - 2b + 9b
51 = 30 + 7b
21 = 7b
3 = b
cari nilai a:
a = 15 - b
a = 15 - 3
a = 12
jadi U6
U6 = a + b(6 -1)
U6 = 12 + 3(5)
U6 = 12 + 15
U6 = 27(E)