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U ₇ = a + 6b
U₁₀ = a + 9b
------------------- +
48 = 2a + 15b .......(2)
eliminasikan pers (1) dan (2)
a + 4b = 10 x2 ===> 2a + 8b = 20
2a + 15b = 48 x1 ===> 2a + 15b = 48
-------------------- -
-7b = -28
b = 4
pers (1)
a + 4b = 10 ===> a + 4 (4) = 10
a + 16 = 10
a = -6
U₉ = a + 8b
= -6 + 8 (4)
= -6 + 32
= 26
Sn = n/2 x (a + Un)
S₉ = 9/2 x (-6 + 26)
= 9/2 x 20
= 90
semoga jelas dan membantu ya