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u9= 150--> a + 8b = 150
dieliminasi
a + 3b = 110
a + 8b = 150
-------------------- -
-5b = - 40
b= 8
a + 3b = 110
a + 3(8) = 110
a + 24 = 110
a = 110 - 24
a = 86
rumus un
un = a + ( n - 1)b
un = 86 + (n -1) 8
un = 86 + 8n - 8
un = 8n - 78
suku ke 30
un = 8n + 78
u30 = 8(30) + 78
u30 = 240 +78
u30 = 318