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U9 = a + 8b
U4+U9 = 2a + 11b = -35 .....(x)
U9-U4 = 5b = -15 ⇒ b=-3
substitusikan ke (x)
2a + 11(-3) = -35
2a = -35 + 33
a = -2/2
a= -1
S6 = 6/2 ( 2(-1) + 5(-3))
= 3 × -16
=-48