a= 5
b=5
U9= a+ 8b
=5 + 8 . 5
= 45
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suku ke 6 = a + 5b = 27
didapat persamaan
a +2b = 12
a + 5 b = 27
----------------- -
eliminasi= -3b = -15
b = 5
substitusi = a+2b = 12
a+ 2.5 = 12
a + 10 = 12
a= 2
U9 = a + (n-1)b
U9 = 2 + (9-1)5
U9 = 2+ 8.5
U9 = 2+40
U9 = 42
a= 5
b=5
U9= a+ 8b
=5 + 8 . 5
= 45