Answer:
a = 3 and b = 4
Step-by-step explanation:
5a + 4b = 31 --(1)
5a + 6b = 39 --(2)
(2) - (1) : 2b = 8
b = 4 -- (3)
Substituting (3) into (1),
5a + 16 = 31
5a = 15
a = 3 -- (4)
Therefore, a = 3 and b = 4
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