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a + 8b = 93
a + 12b = 73
------------------ -
-4b = 20
b = -5
a + 8(-5) = 93
a - 40 = 93
a = 93 + 40 = 133
jadi, a = 133 dan b = -5
U24 = 133 + 23(-5)
= 133 - 115
= 18
S24 = (133 + 18)
= 12 . 151
= 1812
U9 = a + 8b
93 = a + 8 x -5
93 + 40 = a
133 = a
S24 = n/2 ( 2.a + 23b )
= 24/2 ( 2.133 + 23.-5 )
= 12 ( 266 - 115 )
= 12 x 151
= 1812