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Verified answer
U5 = 8 ⇒ a + 4 b = 8U9 = 20 ⇒ a + 8 b = 20
__________-
-4 b = -12
b = 3
semoga betul
U5 = a+4b = 8
_____________ _
4b = 12
b = 12/4
b = 3
Smoga membantu :))