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U9 = a + 8b = 51
2a + 6b = 42 |÷2|
a + 8b = 51 |x1|
a + 3b = 21
a + 8b = 51
-------------- -
-5b = -30
b = 6
substitusi
a + 3(6) = 21
a + 18 = 21
a = 3
U23 = a + 22b
= 3 + 22 x 6
= 3 + 132
= 135