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Verified answer
U5 = a + 4b31 = a + 4b ••• (1)
U9 = a + 8b
59 = a + 8b ••• (2)
a + 4b = 31
a + 8b = 59
----------------- -
-4b = -28
b = 7
a + 4b = 31
a + 4 (7) = 31
a + 28 = 31
a = 3
U12 = a + 11b
U12 = 3 + 11 (7)
U12 = 3 + 77
U12 = 80