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U7 = a+6b = 29
U4 = a+3b = 17
-------------- (di eliminasi)
3b = 12
b = 4
a+3b = 17
a+3(4) = 17
a+12 = 17
a = 5
Un = a + (n-1)b
U31 = 5 + (31-1) 4
= 5 + (30x4)
= 5 + 120
= 125
u7 = 29 --> a + 6b = 29
--------------------------------(-)
3b = 12
b = 4.
U 31 = a +30b = a + 6b + 24b = 17 +24(4)= 113