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a + 7b = 23
2 + 7b = 23
7b = 21
b = 3
U5 = a + 4b
= 2 + 4(3)
= 14
a = 2 ...............[1]
U8 = 23
a + 7b = 23............[2]
substitusi [1] ke [2] didapat
a+7b = 23
2+7b = 23
7b = 23-2
7b = 21
b = 21/7 = 3
Un = a+(n-1)b
Un = 2+(n-1)3
n = 5
U5 = 2+(5-1)3
U5 = 2 + (4)3
U5 = 2+12 = 14